78157013 has 32 divisors (see below), whose sum is σ = 95385600. Its totient is φ = 63201600.

The previous prime is 78156997. The next prime is 78157031. The reversal of 78157013 is 31075187.

It is not a de Polignac number, because 78157013 - 2⁴ = 78156997 is a prime.

It is a super-2 number, since 2×78157013² = 12217037362164338, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78157073) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 341183 + ... + 341411.

It is an arithmetic number, because the mean of its divisors is an integer number (2980800).

Almost surely, 2^78157013 is an apocalyptic number.

It is an amenable number.

78157013 is a deficient number, since it is larger than the sum of its proper divisors (17228587).

78157013 is a wasteful number, since it uses less digits than its factorization.

78157013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353.

The product of its (nonzero) digits is 5880, while the sum is 32.

The square root of 78157013 is about 8840.6455081063. The cubic root of 78157013 is about 427.5523695861.

The spelling of 78157013 in words is "seventy-eight million, one hundred fifty-seven thousand, thirteen".