90020738 has 4 divisors (see below), whose sum is σ = 135031110. Its totient is φ = 45010368.

The previous prime is 90020717. The next prime is 90020747. The reversal of 90020738 is 83702009.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 68277169 + 21743569 = 8263^2 + 4663^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 90020738.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22505183 + ... + 22505186.

Almost surely, 2^90020738 is an apocalyptic number.

90020738 is a deficient number, since it is larger than the sum of its proper divisors (45010372).

90020738 is a wasteful number, since it uses less digits than its factorization.

90020738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45010371.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 90020738 is about 9487.9259061188. The cubic root of 90020738 is about 448.1748925203.

The spelling of 90020738 in words is "ninety million, twenty thousand, seven hundred thirty-eight".