91573990 has 8 divisors (see below), whose sum is σ = 164833200. Its totient is φ = 36629592.

The previous prime is 91573987. The next prime is 91573991. The reversal of 91573990 is 9937519.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91573991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4578690 + ... + 4578709.

It is an arithmetic number, because the mean of its divisors is an integer number (20604150).

Almost surely, 2^91573990 is an apocalyptic number.

91573990 is a deficient number, since it is larger than the sum of its proper divisors (73259210).

91573990 is a wasteful number, since it uses less digits than its factorization.

91573990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9157406.

The product of its (nonzero) digits is 76545, while the sum is 43.

The square root of 91573990 is about 9569.4299725741. The cubic root of 91573990 is about 450.7378676421.

The spelling of 91573990 in words is "ninety-one million, five hundred seventy-three thousand, nine hundred ninety".