78372990 has 24 divisors (see below), whose sum is σ = 203770008. Its totient is φ = 20899440.

The previous prime is 78372947. The next prime is 78373003. The reversal of 78372990 is 9927387.

It is a super-2 number, since 2×78372990² = 12284651123080200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 435316 + ... + 435495.

It is an arithmetic number, because the mean of its divisors is an integer number (8490417).

Almost surely, 2^78372990 is an apocalyptic number.

78372990 is an abundant number, since it is smaller than the sum of its proper divisors (125397018).

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

78372990 is a wasteful number, since it uses less digits than its factorization.

78372990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 870824 (or 870821 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 45.

The square root of 78372990 is about 8852.8520828036. The cubic root of 78372990 is about 427.9458363054.

The spelling of 78372990 in words is "seventy-eight million, three hundred seventy-two thousand, nine hundred ninety".