99891290 has 16 divisors (see below), whose sum is σ = 180910368. Its totient is φ = 39710736.

The previous prime is 99891287. The next prime is 99891329. The reversal of 99891290 is 9219899.

It is a Curzon number.

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, 29012 + ... + 32271.

It is an arithmetic number, because the mean of its divisors is an integer number (11306898).

Almost surely, 2^99891290 is an apocalyptic number.

99891290 is a deficient number, since it is larger than the sum of its proper divisors (81019078).

99891290 is a wasteful number, since it uses less digits than its factorization.

99891290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61453.

The product of its (nonzero) digits is 104976, while the sum is 47.

The square root of 99891290 is about 9994.5630219635. The cubic root of 99891290 is about 463.9906266686.

The spelling of 99891290 in words is "ninety-nine million, eight hundred ninety-one thousand, two hundred ninety".