78763631 has 4 divisors (see below), whose sum is σ = 78794232. Its totient is φ = 78733032.

The previous prime is 78763621. The next prime is 78763651. The reversal of 78763631 is 13636787.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78763631 is a prime.

It is a super-2 number, since 2×78763631² = 12407419136608322, 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 (78763621) 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, 11045 + ... + 16718.

It is an arithmetic number, because the mean of its divisors is an integer number (19698558).

Almost surely, 2^78763631 is an apocalyptic number.

78763631 is a deficient number, since it is larger than the sum of its proper divisors (30601).

78763631 is a wasteful number, since it uses less digits than its factorization.

78763631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30600.

The product of its digits is 127008, while the sum is 41.

The square root of 78763631 is about 8874.8876612608. The cubic root of 78763631 is about 428.6556735604.

The spelling of 78763631 in words is "seventy-eight million, seven hundred sixty-three thousand, six hundred thirty-one".