61457033728 has 20 divisors (see below), whose sum is σ = 122794035210. Its totient is φ = 30728516608.

The previous prime is 61457033717. The next prime is 61457033747. The reversal of 61457033728 is 82733075416.

It is a happy number.

61457033728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 61448460544 + 8573184 = 247888^2 + 2928^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60016123 + ... + 60017146.

Almost surely, 2^61457033728 is an apocalyptic number.

It is an amenable number.

61457033728 is a deficient number, since it is larger than the sum of its proper divisors (61337001482).

61457033728 is an equidigital number, since it uses as much as digits as its factorization.

61457033728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120033287 (or 120033271 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 46.

The spelling of 61457033728 in words is "sixty-one billion, four hundred fifty-seven million, thirty-three thousand, seven hundred twenty-eight".