78783730 has 32 divisors (see below), whose sum is σ = 147744000. Its totient is φ = 30219840.

The previous prime is 78783707. The next prime is 78783739. The reversal of 78783730 is 3738787.

It is a happy number.

It is a super-2 number, since 2×78783730² = 12413752225425800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78783739) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24771 + ... + 27769.

It is an arithmetic number, because the mean of its divisors is an integer number (4617000).

Almost surely, 2^78783730 is an apocalyptic number.

78783730 is a deficient number, since it is larger than the sum of its proper divisors (68960270).

78783730 is a wasteful number, since it uses less digits than its factorization.

78783730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3114.

The product of its (nonzero) digits is 197568, while the sum is 43.

The square root of 78783730 is about 8876.0199413927. The cubic root of 78783730 is about 428.6921320863.

The spelling of 78783730 in words is "seventy-eight million, seven hundred eighty-three thousand, seven hundred thirty".