78630861 has 8 divisors (see below), whose sum is σ = 108456480. Its totient is φ = 50612912.

The previous prime is 78630857. The next prime is 78630863. The reversal of 78630861 is 16803687.

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 78630861 - 2² = 78630857 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78630863) 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, 451815 + ... + 451988.

It is an arithmetic number, because the mean of its divisors is an integer number (13557060).

Almost surely, 2^78630861 is an apocalyptic number.

It is an amenable number.

78630861 is a deficient number, since it is larger than the sum of its proper divisors (29825619).

78630861 is a wasteful number, since it uses less digits than its factorization.

78630861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 903835.

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 78630861 is about 8867.4044116641. The cubic root of 78630861 is about 428.4146798353.

The spelling of 78630861 in words is "seventy-eight million, six hundred thirty thousand, eight hundred sixty-one".