90990137 has 8 divisors (see below), whose sum is σ = 110105856. Its totient is φ = 73403712.

The previous prime is 90990131. The next prime is 90990157. The reversal of 90990137 is 73109909.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 90990137 - 2¹⁰ = 90989113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 90990137.

It is not an unprimeable number, because it can be changed into a prime (90990131) 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, 382193 + ... + 382430.

It is an arithmetic number, because the mean of its divisors is an integer number (13763232).

Almost surely, 2^90990137 is an apocalyptic number.

It is an amenable number.

90990137 is a deficient number, since it is larger than the sum of its proper divisors (19115719).

90990137 is a wasteful number, since it uses less digits than its factorization.

90990137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764647.

The product of its (nonzero) digits is 15309, while the sum is 38.

The square root of 90990137 is about 9538.8750384938. The cubic root of 90990137 is about 449.7778936853. Note that the first 3 decimals are identical.

The spelling of 90990137 in words is "ninety million, nine hundred ninety thousand, one hundred thirty-seven".