90993393 has 18 divisors (see below), whose sum is σ = 132862626. Its totient is φ = 60010272.

The previous prime is 90993377. The next prime is 90993439. The reversal of 90993393 is 39339909.

It can be written as a sum of positive squares in only one way, i.e., 74857104 + 16136289 = 8652^2 + 4017^2 .

It is not a de Polignac number, because 90993393 - 2⁴ = 90993377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90993373) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 95005 + ... + 95957.

It is an arithmetic number, because the mean of its divisors is an integer number (7381257).

Almost surely, 2^90993393 is an apocalyptic number.

It is an amenable number.

90993393 is a deficient number, since it is larger than the sum of its proper divisors (41869233).

90993393 is a wasteful number, since it uses less digits than its factorization.

90993393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1165 (or 1059 counting only the distinct ones).

The product of its (nonzero) digits is 177147, while the sum is 45.

The square root of 90993393 is about 9539.0457069877. The cubic root of 90993393 is about 449.7832585867.

The spelling of 90993393 in words is "ninety million, nine hundred ninety-three thousand, three hundred ninety-three".