78723380 has 24 divisors (see below), whose sum is σ = 167650560. Its totient is φ = 31045280.

The previous prime is 78723377. The next prime is 78723401. The reversal of 78723380 is 8332787.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26300 + ... + 29139.

It is an arithmetic number, because the mean of its divisors is an integer number (6985440).

Almost surely, 2^78723380 is an apocalyptic number.

It is an amenable number.

78723380 is an abundant number, since it is smaller than the sum of its proper divisors (88927180).

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

78723380 is a wasteful number, since it uses less digits than its factorization.

78723380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55519 (or 55517 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 38.

The square root of 78723380 is about 8872.6196807933. The cubic root of 78723380 is about 428.5826417172.

The spelling of 78723380 in words is "seventy-eight million, seven hundred twenty-three thousand, three hundred eighty".