90909057 has 8 divisors (see below), whose sum is σ = 121295520. Its totient is φ = 60564320.

The previous prime is 90909031. The next prime is 90909059. The reversal of 90909057 is 75090909.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 90909057 - 2¹⁴ = 90892673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90909059) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4932 + ... + 14357.

It is an arithmetic number, because the mean of its divisors is an integer number (15161940).

Almost surely, 2^90909057 is an apocalyptic number.

It is an amenable number.

90909057 is a deficient number, since it is larger than the sum of its proper divisors (30386463).

90909057 is a wasteful number, since it uses less digits than its factorization.

90909057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20863.

The product of its (nonzero) digits is 25515, while the sum is 39.

The square root of 90909057 is about 9534.6241142480. The cubic root of 90909057 is about 449.6442571168.

The spelling of 90909057 in words is "ninety million, nine hundred nine thousand, fifty-seven".