91223870 has 32 divisors (see below), whose sum is σ = 178573248. Its totient is φ = 33412608.

The previous prime is 91223861. The next prime is 91223897. The reversal of 91223870 is 7832219.

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, 962 + ... + 13541.

It is an arithmetic number, because the mean of its divisors is an integer number (5580414).

Almost surely, 2^91223870 is an apocalyptic number.

91223870 is a deficient number, since it is larger than the sum of its proper divisors (87349378).

91223870 is a wasteful number, since it uses less digits than its factorization.

91223870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14564.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 91223870 is about 9551.1187826348. The cubic root of 91223870 is about 450.1626901461.

The spelling of 91223870 in words is "ninety-one million, two hundred twenty-three thousand, eight hundred seventy".