90783791 has 16 divisors (see below), whose sum is σ = 110739456. Its totient is φ = 72648576.

The previous prime is 90783787. The next prime is 90783809. The reversal of 90783791 is 19738709.

It is not a de Polignac number, because 90783791 - 2² = 90783787 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 (90783751) 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, 12110 + ... + 18116.

It is an arithmetic number, because the mean of its divisors is an integer number (6921216).

Almost surely, 2^90783791 is an apocalyptic number.

90783791 is a deficient number, since it is larger than the sum of its proper divisors (19955665).

90783791 is a wasteful number, since it uses less digits than its factorization.

90783791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6158.

The product of its (nonzero) digits is 95256, while the sum is 44.

The square root of 90783791 is about 9528.0528441020. The cubic root of 90783791 is about 449.4376366039.

The spelling of 90783791 in words is "ninety million, seven hundred eighty-three thousand, seven hundred ninety-one".