78743631 has 8 divisors (see below), whose sum is σ = 105687424. Its totient is φ = 52147800.

The previous prime is 78743629. The next prime is 78743633. The reversal of 78743631 is 13634787.

It is an interprime number because it is at equal distance from previous prime (78743629) and next prime (78743633).

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

It is not a de Polignac number, because 78743631 - 2¹ = 78743629 is a prime.

It is a super-2 number, since 2×78743631² = 12401118846128322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78743631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78743633) 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, 86461 + ... + 87366.

It is an arithmetic number, because the mean of its divisors is an integer number (13210928).

Almost surely, 2^78743631 is an apocalyptic number.

78743631 is a deficient number, since it is larger than the sum of its proper divisors (26943793).

78743631 is a wasteful number, since it uses less digits than its factorization.

78743631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173981.

The product of its digits is 84672, while the sum is 39.

The square root of 78743631 is about 8873.7608148969. The cubic root of 78743631 is about 428.6193884582.

The spelling of 78743631 in words is "seventy-eight million, seven hundred forty-three thousand, six hundred thirty-one".