74988893281 has 9 divisors (see below), whose sum is σ = 75357916369. Its totient is φ = 74621672500.

The previous prime is 74988893257. The next prime is 74988893323. The reversal of 74988893281 is 18239888947.

The square root of 74988893281 is 273841.

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

It is a de Polignac number, because none of the positive numbers 2^k-74988893281 is a prime.

It is a super-2 number, since 2×74988893281² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74988813281) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 68733546 + ... + 68734636.

Almost surely, 2^74988893281 is an apocalyptic number.

74988893281 is the 273841-st square number.

74988893281 is the 136921-st centered octagonal number.

It is an amenable number.

74988893281 is a deficient number, since it is larger than the sum of its proper divisors (369023088).

74988893281 is an frugal number, since it uses more digits than its factorization.

74988893281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2684 (or 1342 counting only the distinct ones).

The product of its digits is 55738368, while the sum is 67.

The spelling of 74988893281 in words is "seventy-four billion, nine hundred eighty-eight million, eight hundred ninety-three thousand, two hundred eighty-one".