78652665 has 48 divisors (see below), whose sum is σ = 167801088. Its totient is φ = 33187968.

The previous prime is 78652661. The next prime is 78652681. The reversal of 78652665 is 56625687.

It is not a de Polignac number, because 78652665 - 2² = 78652661 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 78652665.

It is not an unprimeable number, because it can be changed into a prime (78652661) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5509 + ... + 13698.

It is an arithmetic number, because the mean of its divisors is an integer number (3495856).

Almost surely, 2^78652665 is an apocalyptic number.

It is an amenable number.

78652665 is an abundant number, since it is smaller than the sum of its proper divisors (89148423).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78652665 is a wasteful number, since it uses less digits than its factorization.

78652665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19238 (or 19235 counting only the distinct ones).

The product of its digits is 604800, while the sum is 45.

The square root of 78652665 is about 8868.6337730228. The cubic root of 78652665 is about 428.4542753592.

The spelling of 78652665 in words is "seventy-eight million, six hundred fifty-two thousand, six hundred sixty-five".