91222690 has 32 divisors (see below), whose sum is σ = 182936880. Its totient is φ = 32519424.

The previous prime is 91222679. The next prime is 91222709. The reversal of 91222690 is 9622219.

It can be written as a sum of positive squares in 8 ways, for example, as 13271449 + 77951241 = 3643^2 + 8829^2 .

It is a super-2 number, since 2×91222690² = 16643158341672200, which contains 22 as substring.

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, 8329 + ... + 15868.

Almost surely, 2^91222690 is an apocalyptic number.

91222690 is an abundant number, since it is smaller than the sum of its proper divisors (91714190).

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

91222690 is a wasteful number, since it uses less digits than its factorization.

91222690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24246.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 91222690 is about 9551.0570095671. The cubic root of 91222690 is about 450.1607491547.

The spelling of 91222690 in words is "ninety-one million, two hundred twenty-two thousand, six hundred ninety".