90768637 has 4 divisors (see below), whose sum is σ = 93898620. Its totient is φ = 87638656.

The previous prime is 90768619. The next prime is 90768653. The reversal of 90768637 is 73686709.

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

It can be written as a sum of positive squares in 2 ways, for example, as 22524516 + 68244121 = 4746^2 + 8261^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90768637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90768617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1564948 + ... + 1565005.

It is an arithmetic number, because the mean of its divisors is an integer number (23474655).

Almost surely, 2^90768637 is an apocalyptic number.

It is an amenable number.

90768637 is a deficient number, since it is larger than the sum of its proper divisors (3129983).

90768637 is a wasteful number, since it uses less digits than its factorization.

90768637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3129982.

The product of its (nonzero) digits is 381024, while the sum is 46.

The square root of 90768637 is about 9527.2575802274. The cubic root of 90768637 is about 449.4126278923.

The spelling of 90768637 in words is "ninety million, seven hundred sixty-eight thousand, six hundred thirty-seven".