90722772 has 72 divisors (see below), whose sum is σ = 262971072. Its totient is φ = 25833600.

The previous prime is 90722747. The next prime is 90722783. The reversal of 90722772 is 27722709.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 130947 + ... + 131637.

It is an arithmetic number, because the mean of its divisors is an integer number (3652376).

Almost surely, 2^90722772 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 90722772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (131485536).

90722772 is an abundant number, since it is smaller than the sum of its proper divisors (172248300).

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

90722772 is a wasteful number, since it uses less digits than its factorization.

90722772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1229 (or 1224 counting only the distinct ones).

The product of its (nonzero) digits is 24696, while the sum is 36.

The square root of 90722772 is about 9524.8502350431. The cubic root of 90722772 is about 449.3369197196.

The spelling of 90722772 in words is "ninety million, seven hundred twenty-two thousand, seven hundred seventy-two".