90509393 has 16 divisors (see below), whose sum is σ = 102176256. Its totient is φ = 79548480.

The previous prime is 90509389. The next prime is 90509413. The reversal of 90509393 is 39390509.

It is a cyclic number.

It is not a de Polignac number, because 90509393 - 2² = 90509389 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90509383) 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, 80471 + ... + 81587.

It is an arithmetic number, because the mean of its divisors is an integer number (6386016).

Almost surely, 2^90509393 is an apocalyptic number.

It is an amenable number.

90509393 is a deficient number, since it is larger than the sum of its proper divisors (11666863).

90509393 is a wasteful number, since it uses less digits than its factorization.

90509393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1424.

The product of its (nonzero) digits is 32805, while the sum is 38.

The square root of 90509393 is about 9513.6424675305. The cubic root of 90509393 is about 448.9843646125.

The spelling of 90509393 in words is "ninety million, five hundred nine thousand, three hundred ninety-three".