61772958128 has 40 divisors (see below), whose sum is σ = 136913632800. Its totient is φ = 26448837120.

The previous prime is 61772958067. The next prime is 61772958131. The reversal of 61772958128 is 82185927716.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 145403 + ... + 380378.

It is an arithmetic number, because the mean of its divisors is an integer number (3422840820).

Almost surely, 2^61772958128 is an apocalyptic number.

It is an amenable number.

61772958128 is an abundant number, since it is smaller than the sum of its proper divisors (75140674672).

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

61772958128 is a wasteful number, since it uses less digits than its factorization.

61772958128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526845 (or 526839 counting only the distinct ones).

The product of its digits is 3386880, while the sum is 56.

The spelling of 61772958128 in words is "sixty-one billion, seven hundred seventy-two million, nine hundred fifty-eight thousand, one hundred twenty-eight".