90408609 has 16 divisors (see below), whose sum is σ = 134216640. Its totient is φ = 60147360.

The previous prime is 90408599. The next prime is 90408641. The reversal of 90408609 is 90680409.

90408609 is a `hidden beast` number, since 9 + 0 + 40 + 8 + 609 = 666.

It is not a de Polignac number, because 90408609 - 2⁷ = 90408481 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (90408509) 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, 10854 + ... + 17280.

It is an arithmetic number, because the mean of its divisors is an integer number (8388540).

Almost surely, 2^90408609 is an apocalyptic number.

It is an amenable number.

90408609 is a deficient number, since it is larger than the sum of its proper divisors (43808031).

90408609 is a wasteful number, since it uses less digits than its factorization.

90408609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6957 (or 6951 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 90408609 is about 9508.3441776158. The cubic root of 90408609 is about 448.8176517264.

The spelling of 90408609 in words is "ninety million, four hundred eight thousand, six hundred nine".