998878790 has 32 divisors (see below), whose sum is σ = 2212902720. Its totient is φ = 316128384.

The previous prime is 998878787. The next prime is 998878823. The reversal of 998878790 is 97878899.

It is a super-2 number, since 2×998878790² = 1995517674223728200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (65).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 547925 + ... + 549744.

It is an arithmetic number, because the mean of its divisors is an integer number (69153210).

Almost surely, 2^998878790 is an apocalyptic number.

998878790 is an abundant number, since it is smaller than the sum of its proper divisors (1214023930).

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

998878790 is a wasteful number, since it uses less digits than its factorization.

998878790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1097696.

The product of its (nonzero) digits is 18289152, while the sum is 65.

The square root of 998878790 is about 31605.0437430484. The cubic root of 998878790 is about 999.6261235672.

The spelling of 998878790 in words is "nine hundred ninety-eight million, eight hundred seventy-eight thousand, seven hundred ninety".