242490578707881 has 81 divisors (see below), whose sum is σ = 409079218038309. Its totient is φ = 138014231721408.

The previous prime is 242490578707859. The next prime is 242490578708033. The reversal of 242490578707881 is 188707875094242.

The square root of 242490578707881 is 15572109.

It is a perfect power (a square), and thus also a powerful number.

242490578707881 is a `hidden beast` number, since 2 + 4 + 2 + 49 + 0 + 578 + 7 + 0 + 7 + 8 + 8 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 172999015162281 + 69491563545600 = 13152909^2 + 8336160^2 .

It is a de Polignac number, because none of the positive numbers 2^k-242490578707881 is a prime.

It is a super-2 number, since 2×242490578707881² (a number of 30 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (242490578707831) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 90582956715 + ... + 90582959391.

Almost surely, 2^{242490578707881} is an apocalyptic number.

242490578707881 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

242490578707881 is the 15572109-th square number.

242490578707881 is the 7786055-th centered octagonal number.

It is an amenable number.

242490578707881 is a deficient number, since it is larger than the sum of its proper divisors (166588639330428).

242490578707881 is an frugal number, since it uses more digits than its factorization.

242490578707881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5928 (or 2964 counting only the distinct ones).

The product of its (nonzero) digits is 505774080, while the sum is 72.

The spelling of 242490578707881 in words is "two hundred forty-two trillion, four hundred ninety billion, five hundred seventy-eight million, seven hundred seven thousand, eight hundred eighty-one".