64449090 has 48 divisors (see below), whose sum is σ = 167966136. Its totient is φ = 17145600.

The previous prime is 64449053. The next prime is 64449097. The reversal of 64449090 is 9094446.

64449090 is a `hidden beast` number, since 644 + 4 + 9 + 0 + 9 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 33212169 + 31236921 = 5763^2 + 5589^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64449097) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 68020 + ... + 68960.

Almost surely, 2^64449090 is an apocalyptic number.

64449090 is an abundant number, since it is smaller than the sum of its proper divisors (103517046).

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

64449090 is a wasteful number, since it uses less digits than its factorization.

64449090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1715 (or 1712 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 64449090 is about 8028.0190582733. The cubic root of 64449090 is about 400.9334242702.

The spelling of 64449090 in words is "sixty-four million, four hundred forty-nine thousand, ninety".