78086831 has 8 divisors (see below), whose sum is σ = 82762560. Its totient is φ = 73420288.

The previous prime is 78086807. The next prime is 78086851. The reversal of 78086831 is 13868087.

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 78086831 - 2¹⁸ = 77824687 is a prime.

It is a super-2 number, since 2×78086831² = 12195106351245122, 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 (78086851) 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, 23735 + ... + 26823.

It is an arithmetic number, because the mean of its divisors is an integer number (10345320).

Almost surely, 2^78086831 is an apocalyptic number.

78086831 is a deficient number, since it is larger than the sum of its proper divisors (4675729).

78086831 is a wasteful number, since it uses less digits than its factorization.

78086831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4593.

The product of its (nonzero) digits is 64512, while the sum is 41.

The square root of 78086831 is about 8836.6753363468. The cubic root of 78086831 is about 427.4243560516.

The spelling of 78086831 in words is "seventy-eight million, eighty-six thousand, eight hundred thirty-one".