61057040 has 40 divisors (see below), whose sum is σ = 154865088. Its totient is φ = 22202240.

The previous prime is 61057039. The next prime is 61057043. The reversal of 61057040 is 4075016.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 61056997 and 61057015.

It is not an unprimeable number, because it can be changed into a prime (61057043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33812 + ... + 35571.

Almost surely, 2^61057040 is an apocalyptic number.

It is an amenable number.

61057040 is an abundant number, since it is smaller than the sum of its proper divisors (93808048).

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

61057040 is a wasteful number, since it uses less digits than its factorization.

61057040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69407 (or 69401 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 61057040 is about 7813.9004344821. The cubic root of 61057040 is about 393.7723783368.

The spelling of 61057040 in words is "sixty-one million, fifty-seven thousand, forty".