78474431 has 12 divisors (see below), whose sum is σ = 96657408. Its totient is φ = 63306432.

The previous prime is 78474401. The next prime is 78474439. The reversal of 78474431 is 13447487.

It is a de Polignac number, because none of the positive numbers 2^k-78474431 is a prime.

It is a super-2 number, since 2×78474431² = 12316472641547522, 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 (78474439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46271 + ... + 47936.

It is an arithmetic number, because the mean of its divisors is an integer number (8054784).

Almost surely, 2^78474431 is an apocalyptic number.

78474431 is a deficient number, since it is larger than the sum of its proper divisors (18182977).

78474431 is a wasteful number, since it uses less digits than its factorization.

78474431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94238 (or 94231 counting only the distinct ones).

The product of its digits is 75264, while the sum is 38.

The square root of 78474431 is about 8858.5795136692. The cubic root of 78474431 is about 428.1303919686.

The spelling of 78474431 in words is "seventy-eight million, four hundred seventy-four thousand, four hundred thirty-one".