90988779 has 16 divisors (see below), whose sum is σ = 140025600. Its totient is φ = 51477600.

The previous prime is 90988753. The next prime is 90988819. The reversal of 90988779 is 97788909.

It is a happy number.

It is not a de Polignac number, because 90988779 - 2¹⁶ = 90923243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90984779) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19329 + ... + 23570.

It is an arithmetic number, because the mean of its divisors is an integer number (8751600).

Almost surely, 2^90988779 is an apocalyptic number.

90988779 is a deficient number, since it is larger than the sum of its proper divisors (49036821).

90988779 is a wasteful number, since it uses less digits than its factorization.

90988779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43010.

The product of its (nonzero) digits is 2286144, while the sum is 57.

The square root of 90988779 is about 9538.8038558301. The cubic root of 90988779 is about 449.7756560749.

The spelling of 90988779 in words is "ninety million, nine hundred eighty-eight thousand, seven hundred seventy-nine".