84807990 has 24 divisors (see below), whose sum is σ = 220501008. Its totient is φ = 22615440.

The previous prime is 84807979. The next prime is 84807991. The reversal of 84807990 is 9970848.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84807991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 471066 + ... + 471245.

It is an arithmetic number, because the mean of its divisors is an integer number (9187542).

Almost surely, 2^84807990 is an apocalyptic number.

84807990 is an abundant number, since it is smaller than the sum of its proper divisors (135693018).

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

84807990 is a wasteful number, since it uses less digits than its factorization.

84807990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 942324 (or 942321 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 84807990 is about 9209.1253656360. The cubic root of 84807990 is about 439.3516449582.

The spelling of 84807990 in words is "eighty-four million, eight hundred seven thousand, nine hundred ninety".