78057929 has 16 divisors (see below), whose sum is σ = 83884032. Its totient is φ = 72463248.

The previous prime is 78057919. The next prime is 78057977. The reversal of 78057929 is 92975087.

It is not a de Polignac number, because 78057929 - 2⁴ = 78057913 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78057919) 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, 175982 + ... + 176424.

It is an arithmetic number, because the mean of its divisors is an integer number (5242752).

Almost surely, 2^78057929 is an apocalyptic number.

It is an amenable number.

78057929 is a deficient number, since it is larger than the sum of its proper divisors (5826103).

78057929 is a wasteful number, since it uses less digits than its factorization.

78057929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 676.

The product of its (nonzero) digits is 317520, while the sum is 47.

The square root of 78057929 is about 8835.0398414495. The cubic root of 78057929 is about 427.3716158605.

The spelling of 78057929 in words is "seventy-eight million, fifty-seven thousand, nine hundred twenty-nine".