78156057 has 8 divisors (see below), whose sum is σ = 119094976. Its totient is φ = 44660592.

The previous prime is 78156031. The next prime is 78156077. The reversal of 78156057 is 75065187.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78156057 - 2⁶ = 78155993 is a prime.

It is a super-2 number, since 2×78156057² = 12216738491574498, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78156077) 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, 1860838 + ... + 1860879.

It is an arithmetic number, because the mean of its divisors is an integer number (14886872).

Almost surely, 2^78156057 is an apocalyptic number.

It is an amenable number.

78156057 is a deficient number, since it is larger than the sum of its proper divisors (40938919).

78156057 is a wasteful number, since it uses less digits than its factorization.

78156057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3721727.

The product of its (nonzero) digits is 58800, while the sum is 39.

The square root of 78156057 is about 8840.5914394909. The cubic root of 78156057 is about 427.5506263357.

The spelling of 78156057 in words is "seventy-eight million, one hundred fifty-six thousand, fifty-seven".