78161057 has 16 divisors (see below), whose sum is σ = 88482240. Its totient is φ = 68548032.

The previous prime is 78161051. The next prime is 78161059. The reversal of 78161057 is 75016187.

It is a cyclic number.

It is not a de Polignac number, because 78161057 - 2¹² = 78156961 is a prime.

It is a super-2 number, since 2×78161057² = 12218301662714498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78161051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18794 + ... + 22572.

It is an arithmetic number, because the mean of its divisors is an integer number (5530140).

Almost surely, 2^78161057 is an apocalyptic number.

It is an amenable number.

78161057 is a deficient number, since it is larger than the sum of its proper divisors (10321183).

78161057 is a wasteful number, since it uses less digits than its factorization.

78161057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3872.

The product of its (nonzero) digits is 11760, while the sum is 35.

The square root of 78161057 is about 8840.8742214783. The cubic root of 78161057 is about 427.5597435968.

The spelling of 78161057 in words is "seventy-eight million, one hundred sixty-one thousand, fifty-seven".