78936431 has 8 divisors (see below), whose sum is σ = 94961280. Its totient is φ = 64098648.

The previous prime is 78936427. The next prime is 78936461. The reversal of 78936431 is 13463987.

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

It is a cyclic number.

It is not a de Polignac number, because 78936431 - 2² = 78936427 is a prime.

It is a super-2 number, since 2×78936431² = 12461920278035522, 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 (78936401) 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, 296621 + ... + 296886.

It is an arithmetic number, because the mean of its divisors is an integer number (11870160).

Almost surely, 2^78936431 is an apocalyptic number.

78936431 is a deficient number, since it is larger than the sum of its proper divisors (16024849).

78936431 is a wasteful number, since it uses less digits than its factorization.

78936431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 593533.

The product of its digits is 108864, while the sum is 41.

The square root of 78936431 is about 8884.6176620044. The cubic root of 78936431 is about 428.9689213399.

The spelling of 78936431 in words is "seventy-eight million, nine hundred thirty-six thousand, four hundred thirty-one".