90402064 has 15 divisors (see below), whose sum is σ = 175227717. Its totient is φ = 45182016.

The previous prime is 90402049. The next prime is 90402083. The reversal of 90402064 is 46020409.

The square root of 90402064 is 9508.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 35760400 + 54641664 = 5980^2 + 7392^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 36844 + ... + 39220.

Almost surely, 2^90402064 is an apocalyptic number.

90402064 is the 9508-th square number.

It is an amenable number.

90402064 is a deficient number, since it is larger than the sum of its proper divisors (84825653).

90402064 is an frugal number, since it uses more digits than its factorization.

90402064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4762 (or 2379 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The cubic root of 90402064 is about 448.8068209643.

Multiplying 90402064 by its sum of digits (25), we get a square (2260051600 = 47540²).

The spelling of 90402064 in words is "ninety million, four hundred two thousand, sixty-four".