249678990 has 64 divisors (see below), whose sum is σ = 726347520. Its totient is φ = 60527520.

The previous prime is 249678959. The next prime is 249679033. The reversal of 249678990 is 99876942.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39064 + ... + 45003.

It is an arithmetic number, because the mean of its divisors is an integer number (11349180).

Almost surely, 2^249678990 is an apocalyptic number.

249678990 is an abundant number, since it is smaller than the sum of its proper divisors (476668530).

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

249678990 is a wasteful number, since it uses less digits than its factorization.

249678990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84094 (or 84088 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 54.

The square root of 249678990 is about 15801.2338125856. The cubic root of 249678990 is about 629.6907779550.

The spelling of 249678990 in words is "two hundred forty-nine million, six hundred seventy-eight thousand, nine hundred ninety".