90331420 has 12 divisors (see below), whose sum is σ = 189696024. Its totient is φ = 36132560.

The previous prime is 90331403. The next prime is 90331429. The reversal of 90331420 is 2413309.

It is a junction number, because it is equal to n+sod(n) for n = 90331391 and 90331400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90331429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2258266 + ... + 2258305.

It is an arithmetic number, because the mean of its divisors is an integer number (15808002).

Almost surely, 2^90331420 is an apocalyptic number.

It is an amenable number.

90331420 is an abundant number, since it is smaller than the sum of its proper divisors (99364604).

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

90331420 is a wasteful number, since it uses less digits than its factorization.

90331420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4516580 (or 4516578 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 90331420 is about 9504.2842970947. The cubic root of 90331420 is about 448.6898849494.

Adding to 90331420 its reverse (2413309), we get a palindrome (92744729).

It can be divided in two parts, 903 and 31420, that added together give a palindrome (32323).

The spelling of 90331420 in words is "ninety million, three hundred thirty-one thousand, four hundred twenty".