90321420 has 48 divisors (see below), whose sum is σ = 289029888. Its totient is φ = 20644800.

The previous prime is 90321409. The next prime is 90321461. The reversal of 90321420 is 2412309.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107106 + ... + 107945.

It is an arithmetic number, because the mean of its divisors is an integer number (6021456).

Almost surely, 2^90321420 is an apocalyptic number.

It is an amenable number.

90321420 is an abundant number, since it is smaller than the sum of its proper divisors (198708468).

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

90321420 is a wasteful number, since it uses less digits than its factorization.

90321420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215070 (or 215068 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 90321420 is about 9503.7582039949. The cubic root of 90321420 is about 448.6733271653.

Adding to 90321420 its reverse (2412309), we get a palindrome (92733729).

The spelling of 90321420 in words is "ninety million, three hundred twenty-one thousand, four hundred twenty".