90909147 has 32 divisors (see below), whose sum is σ = 141926400. Its totient is φ = 50688288.

The previous prime is 90909127. The next prime is 90909157. The reversal of 90909147 is 74190909.

It is not a de Polignac number, because 90909147 - 2²⁰ = 89860571 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90909127) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 295968 + ... + 296274.

It is an arithmetic number, because the mean of its divisors is an integer number (4435200).

Almost surely, 2^90909147 is an apocalyptic number.

90909147 is a deficient number, since it is larger than the sum of its proper divisors (51017253).

90909147 is a wasteful number, since it uses less digits than its factorization.

90909147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615.

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

The square root of 90909147 is about 9534.6288338876. The cubic root of 90909147 is about 449.6444054994.

The spelling of 90909147 in words is "ninety million, nine hundred nine thousand, one hundred forty-seven".