99661790 has 16 divisors (see below), whose sum is σ = 181849968. Its totient is φ = 39318336.

The previous prime is 99661753. The next prime is 99661799. The reversal of 99661790 is 9716699.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99661799) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67532 + ... + 68991.

It is an arithmetic number, because the mean of its divisors is an integer number (11365623).

Almost surely, 2^99661790 is an apocalyptic number.

99661790 is a deficient number, since it is larger than the sum of its proper divisors (82188178).

99661790 is a wasteful number, since it uses less digits than its factorization.

99661790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136603.

The product of its (nonzero) digits is 183708, while the sum is 47.

The square root of 99661790 is about 9983.0751775192. The cubic root of 99661790 is about 463.6350150719.

The spelling of 99661790 in words is "ninety-nine million, six hundred sixty-one thousand, seven hundred ninety".