90524721 has 24 divisors (see below), whose sum is σ = 145596864. Its totient is φ = 49001760.

The previous prime is 90524717. The next prime is 90524729. The reversal of 90524721 is 12742509.

It is not a de Polignac number, because 90524721 - 2² = 90524717 is a prime.

It is a super-2 number, since 2×90524721² = 16389450224255682, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (90524729) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1611 + ... + 13551.

It is an arithmetic number, because the mean of its divisors is an integer number (6066536).

Almost surely, 2^90524721 is an apocalyptic number.

It is an amenable number.

90524721 is a deficient number, since it is larger than the sum of its proper divisors (55072143).

90524721 is a wasteful number, since it uses less digits than its factorization.

90524721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11989 (or 11970 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 90524721 is about 9514.4480134162. The cubic root of 90524721 is about 449.0097087366.

The spelling of 90524721 in words is "ninety million, five hundred twenty-four thousand, seven hundred twenty-one".