90420432 has 20 divisors (see below), whose sum is σ = 233586240. Its totient is φ = 30140128.

The previous prime is 90420431. The next prime is 90420437. The reversal of 90420432 is 23402409.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90420431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 941832 + ... + 941927.

It is an arithmetic number, because the mean of its divisors is an integer number (11679312).

Almost surely, 2^90420432 is an apocalyptic number.

It is an amenable number.

90420432 is an abundant number, since it is smaller than the sum of its proper divisors (143165808).

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

90420432 is a wasteful number, since it uses less digits than its factorization.

90420432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1883770 (or 1883764 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 90420432 is about 9508.9658743735. The cubic root of 90420432 is about 448.8372152756.

The spelling of 90420432 in words is "ninety million, four hundred twenty thousand, four hundred thirty-two".