78657630 has 16 divisors (see below), whose sum is σ = 188778384. Its totient is φ = 20975360.

The previous prime is 78657619. The next prime is 78657637. The reversal of 78657630 is 3675687.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78657637) 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, 1310931 + ... + 1310990.

It is an arithmetic number, because the mean of its divisors is an integer number (11798649).

Almost surely, 2^78657630 is an apocalyptic number.

78657630 is an abundant number, since it is smaller than the sum of its proper divisors (110120754).

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

78657630 is a wasteful number, since it uses less digits than its factorization.

78657630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2621931.

The product of its (nonzero) digits is 211680, while the sum is 42.

The square root of 78657630 is about 8868.9136877072. The cubic root of 78657630 is about 428.4632906532.

The spelling of 78657630 in words is "seventy-eight million, six hundred fifty-seven thousand, six hundred thirty".