87991098 has 16 divisors (see below), whose sum is σ = 189519456. Its totient is φ = 27074160.

The previous prime is 87991063. The next prime is 87991139. The reversal of 87991098 is 89019978.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 87991098.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 563968 + ... + 564123.

It is an arithmetic number, because the mean of its divisors is an integer number (11844966).

Almost surely, 2^87991098 is an apocalyptic number.

87991098 is an abundant number, since it is smaller than the sum of its proper divisors (101528358).

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

87991098 is a wasteful number, since it uses less digits than its factorization.

87991098 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1128109.

The product of its (nonzero) digits is 326592, while the sum is 51.

The square root of 87991098 is about 9380.3570294526. The cubic root of 87991098 is about 444.7810192211.

The spelling of 87991098 in words is "eighty-seven million, nine hundred ninety-one thousand, ninety-eight".