90402913 has 8 divisors (see below), whose sum is σ = 93461760. Its totient is φ = 87353040.

The previous prime is 90402911. The next prime is 90402929. The reversal of 90402913 is 31920409.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 90402913 - 2¹ = 90402911 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90402911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22878 + ... + 26536.

It is an arithmetic number, because the mean of its divisors is an integer number (11682720).

Almost surely, 2^90402913 is an apocalyptic number.

It is an amenable number.

90402913 is a deficient number, since it is larger than the sum of its proper divisors (3058847).

90402913 is a wasteful number, since it uses less digits than its factorization.

90402913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4487.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 90402913 is about 9508.0446465086. The cubic root of 90402913 is about 448.8082259315.

The spelling of 90402913 in words is "ninety million, four hundred two thousand, nine hundred thirteen".