78620651 has 4 divisors (see below), whose sum is σ = 82758600. Its totient is φ = 74482704.

The previous prime is 78620639. The next prime is 78620683. The reversal of 78620651 is 15602687.

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

It is a cyclic number.

It is not a de Polignac number, because 78620651 - 2⁶ = 78620587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78620611) 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, 2068946 + ... + 2068983.

It is an arithmetic number, because the mean of its divisors is an integer number (20689650).

Almost surely, 2^78620651 is an apocalyptic number.

78620651 is a deficient number, since it is larger than the sum of its proper divisors (4137949).

78620651 is a wasteful number, since it uses less digits than its factorization.

78620651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4137948.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 78620651 is about 8866.8286889959. The cubic root of 78620651 is about 428.3961362120.

The spelling of 78620651 in words is "seventy-eight million, six hundred twenty thousand, six hundred fifty-one".