7920990 has 160 divisors (see below), whose sum is σ = 26763264. Its totient is φ = 1632960.

The previous prime is 7920959. The next prime is 7921003. The reversal of 7920990 is 990297.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 62307 + ... + 62433.

Almost surely, 2^7920990 is an apocalyptic number.

7920990 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 7920990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13381632).

7920990 is an abundant number, since it is smaller than the sum of its proper divisors (18842274).

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

7920990 is a wasteful number, since it uses less digits than its factorization.

7920990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164 (or 155 counting only the distinct ones).

The product of its (nonzero) digits is 10206, while the sum is 36.

The square root of 7920990 is about 2814.4253409888. The cubic root of 7920990 is about 199.3394037989.

The spelling of 7920990 in words is "seven million, nine hundred twenty thousand, nine hundred ninety".