78780890 has 64 divisors (see below), whose sum is σ = 156204288. Its totient is φ = 28492800.

The previous prime is 78780887. The next prime is 78780901. The reversal of 78780890 is 9808787.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 736217 + ... + 736323.

It is an arithmetic number, because the mean of its divisors is an integer number (2440692).

Almost surely, 2^78780890 is an apocalyptic number.

78780890 is a deficient number, since it is larger than the sum of its proper divisors (77423398).

78780890 is a wasteful number, since it uses less digits than its factorization.

78780890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263.

The product of its (nonzero) digits is 225792, while the sum is 47.

The square root of 78780890 is about 8875.8599583364. The cubic root of 78780890 is about 428.6869808523.

The spelling of 78780890 in words is "seventy-eight million, seven hundred eighty thousand, eight hundred ninety".