91220352 has 128 divisors (see below), whose sum is σ = 255897600. Its totient is φ = 28753920.

The previous prime is 91220347. The next prime is 91220357. The reversal of 91220352 is 25302219.

It is an interprime number because it is at equal distance from previous prime (91220347) and next prime (91220357).

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91220357) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 940368 + ... + 940464.

It is an arithmetic number, because the mean of its divisors is an integer number (1999200).

Almost surely, 2^91220352 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91220352, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (127948800).

91220352 is an abundant number, since it is smaller than the sum of its proper divisors (164677248).

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

91220352 is a wasteful number, since it uses less digits than its factorization.

91220352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224 (or 212 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 91220352 is about 9550.9346139527. The cubic root of 91220352 is about 450.1569033102.

The spelling of 91220352 in words is "ninety-one million, two hundred twenty thousand, three hundred fifty-two".