90749109 has 16 divisors (see below), whose sum is σ = 132816384. Its totient is φ = 54658800.

The previous prime is 90749093. The next prime is 90749119. The reversal of 90749109 is 90194709.

It is not a de Polignac number, because 90749109 - 2⁴ = 90749093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90749119) 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, 3057 + ... + 13814.

It is an arithmetic number, because the mean of its divisors is an integer number (8301024).

Almost surely, 2^90749109 is an apocalyptic number.

It is an amenable number.

90749109 is a deficient number, since it is larger than the sum of its proper divisors (42067275).

90749109 is a wasteful number, since it uses less digits than its factorization.

90749109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17048.

The product of its (nonzero) digits is 20412, while the sum is 39.

The square root of 90749109 is about 9526.2326761422. The cubic root of 90749109 is about 449.3803966447.

The spelling of 90749109 in words is "ninety million, seven hundred forty-nine thousand, one hundred nine".