61257784380 has 96 divisors (see below), whose sum is σ = 184759224384. Its totient is φ = 15075293184.

The previous prime is 61257784369. The next prime is 61257784403. The reversal of 61257784380 is 8348775216.

It is a super-2 number, since 2×61257784380² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5170944 + ... + 5182776.

It is an arithmetic number, because the mean of its divisors is an integer number (1924575254).

Almost surely, 2^61257784380 is an apocalyptic number.

61257784380 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61257784380 is an abundant number, since it is smaller than the sum of its proper divisors (123501440004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61257784380 is a wasteful number, since it uses less digits than its factorization.

61257784380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18495 (or 18493 counting only the distinct ones).

The product of its (nonzero) digits is 2257920, while the sum is 51.

The spelling of 61257784380 in words is "sixty-one billion, two hundred fifty-seven million, seven hundred eighty-four thousand, three hundred eighty".