78978237 has 16 divisors (see below), whose sum is σ = 114511488. Its totient is φ = 48127680.

The previous prime is 78978233. The next prime is 78978287. The reversal of 78978237 is 73287987.

It is not a de Polignac number, because 78978237 - 2² = 78978233 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78978237.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78978233) 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, 5814 + ... + 13847.

It is an arithmetic number, because the mean of its divisors is an integer number (7156968).

Almost surely, 2^78978237 is an apocalyptic number.

It is an amenable number.

78978237 is a deficient number, since it is larger than the sum of its proper divisors (35533251).

78978237 is a wasteful number, since it uses less digits than its factorization.

78978237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19780.

The product of its digits is 1185408, while the sum is 51.

The square root of 78978237 is about 8886.9700685892. The cubic root of 78978237 is about 429.0446375817.

The spelling of 78978237 in words is "seventy-eight million, nine hundred seventy-eight thousand, two hundred thirty-seven".