78313651 has 4 divisors (see below), whose sum is σ = 84337792. Its totient is φ = 72289512.

The previous prime is 78313589. The next prime is 78313667. The reversal of 78313651 is 15631387.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15631387 = 277 ⋅56431.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78313651 is a prime.

It is a super-2 number, since 2×78313651² = 12266055865899602, which contains 22 as substring.

It is the 8850-th Hogben number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78313751) by changing a digit.

It is a nontrivial repunit in base 8849.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3012051 + ... + 3012076.

It is an arithmetic number, because the mean of its divisors is an integer number (21084448).

Almost surely, 2^78313651 is an apocalyptic number.

78313651 is a deficient number, since it is larger than the sum of its proper divisors (6024141).

78313651 is a wasteful number, since it uses less digits than its factorization.

78313651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6024140.

The product of its digits is 15120, while the sum is 34.

The square root of 78313651 is about 8849.5000423753. The cubic root of 78313651 is about 427.8378046584.

The spelling of 78313651 in words is "seventy-eight million, three hundred thirteen thousand, six hundred fifty-one".