90215940 has 96 divisors (see below), whose sum is σ = 269305344. Its totient is φ = 22487040.

The previous prime is 90215903. The next prime is 90215977. The reversal of 90215940 is 4951209.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (90215903) and next prime (90215977).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 90215898 and 90215907.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 245637 + ... + 246003.

It is an arithmetic number, because the mean of its divisors is an integer number (2805264).

Almost surely, 2^90215940 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 90215940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (134652672).

90215940 is an abundant number, since it is smaller than the sum of its proper divisors (179089404).

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

90215940 is a wasteful number, since it uses less digits than its factorization.

90215940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637 (or 635 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 90215940 is about 9498.2071992561. The cubic root of 90215940 is about 448.4986011796.

The spelling of 90215940 in words is "ninety million, two hundred fifteen thousand, nine hundred forty".