90137779 has 4 divisors (see below), whose sum is σ = 90290376. Its totient is φ = 89985184.

The previous prime is 90137737. The next prime is 90137783. The reversal of 90137779 is 97773109.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 90137779 - 2⁷ = 90137651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90137279) 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, 75409 + ... + 76594.

It is an arithmetic number, because the mean of its divisors is an integer number (22572594).

Almost surely, 2^90137779 is an apocalyptic number.

90137779 is a deficient number, since it is larger than the sum of its proper divisors (152597).

90137779 is a wasteful number, since it uses less digits than its factorization.

90137779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152596.

The product of its (nonzero) digits is 83349, while the sum is 43.

The square root of 90137779 is about 9494.0917943740. The cubic root of 90137779 is about 448.3690408244.

The spelling of 90137779 in words is "ninety million, one hundred thirty-seven thousand, seven hundred seventy-nine".