90072081 has 48 divisors (see below), whose sum is σ = 152076288. Its totient is φ = 52779600.

The previous prime is 90072079. The next prime is 90072107. The reversal of 90072081 is 18027009.

It is not a de Polignac number, because 90072081 - 2¹ = 90072079 is a prime.

It is a super-2 number, since 2×90072081² = 16225959551341122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90072061) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 82320 + ... + 83406.

It is an arithmetic number, because the mean of its divisors is an integer number (3168256).

Almost surely, 2^90072081 is an apocalyptic number.

It is an amenable number.

90072081 is a deficient number, since it is larger than the sum of its proper divisors (62004207).

90072081 is a wasteful number, since it uses less digits than its factorization.

90072081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1144 (or 1132 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 90072081 is about 9490.6312224214. The cubic root of 90072081 is about 448.2600812991.

The spelling of 90072081 in words is "ninety million, seventy-two thousand, eighty-one".