90721652 has 24 divisors (see below), whose sum is σ = 182375424. Its totient is φ = 38680992.

The previous prime is 90721651. The next prime is 90721661. The reversal of 90721652 is 25612709.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90721651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2708 + ... + 13739.

It is an arithmetic number, because the mean of its divisors is an integer number (7598976).

Almost surely, 2^90721652 is an apocalyptic number.

It is an amenable number.

90721652 is an abundant number, since it is smaller than the sum of its proper divisors (91653772).

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

90721652 is a wasteful number, since it uses less digits than its factorization.

90721652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16655 (or 16653 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 90721652 is about 9524.7914412863. The cubic root of 90721652 is about 449.3350706454.

The spelling of 90721652 in words is "ninety million, seven hundred twenty-one thousand, six hundred fifty-two".