90909736 has 8 divisors (see below), whose sum is σ = 170455770. Its totient is φ = 45454864.

The previous prime is 90909733. The next prime is 90909773. The reversal of 90909736 is 63790909.

It can be written as a sum of positive squares in only one way, i.e., 77264100 + 13645636 = 8790^2 + 3694^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 90909692 and 90909701.

It is not an unprimeable number, because it can be changed into a prime (90909733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5681851 + ... + 5681866.

Almost surely, 2^90909736 is an apocalyptic number.

It is an amenable number.

90909736 is a deficient number, since it is larger than the sum of its proper divisors (79546034).

90909736 is a wasteful number, since it uses less digits than its factorization.

90909736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11363723 (or 11363719 counting only the distinct ones).

The product of its (nonzero) digits is 91854, while the sum is 43.

The square root of 90909736 is about 9534.6597212486. The cubic root of 90909736 is about 449.6453765788.

The spelling of 90909736 in words is "ninety million, nine hundred nine thousand, seven hundred thirty-six".