78779904 has 160 divisors (see below), whose sum is σ = 254555136. Its totient is φ = 21135360.

The previous prime is 78779903. The next prime is 78779923. The reversal of 78779904 is 40997787.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78779903) 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, 182569 + ... + 182999.

Almost surely, 2^78779904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78779904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (127277568).

78779904 is an abundant number, since it is smaller than the sum of its proper divisors (175775232).

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

78779904 is a wasteful number, since it uses less digits than its factorization.

78779904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476 (or 460 counting only the distinct ones).

The product of its (nonzero) digits is 889056, while the sum is 51.

The square root of 78779904 is about 8875.8044142489. The cubic root of 78779904 is about 428.6851924020.

The spelling of 78779904 in words is "seventy-eight million, seven hundred seventy-nine thousand, nine hundred four".