90064840 has 32 divisors (see below), whose sum is σ = 203041080. Its totient is φ = 35955712.

The previous prime is 90064837. The next prime is 90064841. The reversal of 90064840 is 4846009.

It can be written as a sum of positive squares in 4 ways, for example, as 49028004 + 41036836 = 7002^2 + 6406^2 .

It is a super-2 number, since 2×90064840² = 16223350808451200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (90064841) 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, 21822 + ... + 25618.

Almost surely, 2^90064840 is an apocalyptic number.

It is an amenable number.

90064840 is an abundant number, since it is smaller than the sum of its proper divisors (112976240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

90064840 is a wasteful number, since it uses less digits than its factorization.

90064840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4401 (or 4397 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 90064840 is about 9490.2497332789. The cubic root of 90064840 is about 448.2480689264.

The spelling of 90064840 in words is "ninety million, sixty-four thousand, eight hundred forty".