78974431 has 4 divisors (see below), whose sum is σ = 83131000. Its totient is φ = 74817864.

The previous prime is 78974411. The next prime is 78974447. The reversal of 78974431 is 13447987.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78974431 - 2¹⁵ = 78941663 is a prime.

It is a super-2 number, since 2×78974431² = 12473921503547522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78974411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2078256 + ... + 2078293.

It is an arithmetic number, because the mean of its divisors is an integer number (20782750).

Almost surely, 2^78974431 is an apocalyptic number.

78974431 is a deficient number, since it is larger than the sum of its proper divisors (4156569).

78974431 is a wasteful number, since it uses less digits than its factorization.

78974431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4156568.

The product of its digits is 169344, while the sum is 43.

The square root of 78974431 is about 8886.7559322849. The cubic root of 78974431 is about 429.0377455138.

The spelling of 78974431 in words is "seventy-eight million, nine hundred seventy-four thousand, four hundred thirty-one".