78290431 has 12 divisors (see below), whose sum is σ = 83283552. Its totient is φ = 73581984.

The previous prime is 78290419. The next prime is 78290461. The reversal of 78290431 is 13409287.

It is a de Polignac number, because none of the positive numbers 2^k-78290431 is a prime.

It is a super-2 number, since 2×78290431² = 12258783172331522, 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 (78290461) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48666 + ... + 50248.

It is an arithmetic number, because the mean of its divisors is an integer number (6940296).

Almost surely, 2^78290431 is an apocalyptic number.

78290431 is a deficient number, since it is larger than the sum of its proper divisors (4993121).

78290431 is a wasteful number, since it uses less digits than its factorization.

78290431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1758 (or 1739 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 78290431 is about 8848.1880065921. The cubic root of 78290431 is about 427.7955158377.

The spelling of 78290431 in words is "seventy-eight million, two hundred ninety thousand, four hundred thirty-one".