78687351 has 12 divisors (see below), whose sum is σ = 115804728. Its totient is φ = 51468144.

The previous prime is 78687311. The next prime is 78687359. The reversal of 78687351 is 15378687.

It is not a de Polignac number, because 78687351 - 2¹⁰ = 78686327 is a prime.

It is a nialpdrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 78687297 and 78687306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78687359) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 82005 + ... + 82958.

It is an arithmetic number, because the mean of its divisors is an integer number (9650394).

Almost surely, 2^78687351 is an apocalyptic number.

78687351 is a deficient number, since it is larger than the sum of its proper divisors (37117377).

78687351 is a wasteful number, since it uses less digits than its factorization.

78687351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165022 (or 165019 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The square root of 78687351 is about 8870.5891010688. The cubic root of 78687351 is about 428.5172491986.

The spelling of 78687351 in words is "seventy-eight million, six hundred eighty-seven thousand, three hundred fifty-one".