78463931 has 8 divisors (see below), whose sum is σ = 96571104. Its totient is φ = 62081280.

The previous prime is 78463919. The next prime is 78463933. The reversal of 78463931 is 13936487.

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 78463931 - 2¹⁰ = 78462907 is a prime.

It is a super-2 number, since 2×78463931² = 12313176935945522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78463933) 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, 431030 + ... + 431211.

It is an arithmetic number, because the mean of its divisors is an integer number (12071388).

Almost surely, 2^78463931 is an apocalyptic number.

78463931 is a deficient number, since it is larger than the sum of its proper divisors (18107173).

78463931 is a wasteful number, since it uses less digits than its factorization.

78463931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862261.

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

The square root of 78463931 is about 8857.9868480372. The cubic root of 78463931 is about 428.1112962811. Note that the first 3 decimals are identical.

The spelling of 78463931 in words is "seventy-eight million, four hundred sixty-three thousand, nine hundred thirty-one".