64475380 has 12 divisors (see below), whose sum is σ = 135398340. Its totient is φ = 25790144.

The previous prime is 64475357. The next prime is 64475431. The reversal of 64475380 is 8357446.

It can be written as a sum of positive squares in 2 ways, for example, as 40602384 + 23872996 = 6372^2 + 4886^2 .

It is a super-2 number, since 2×64475380² = 8314149252288800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1611865 + ... + 1611904.

It is an arithmetic number, because the mean of its divisors is an integer number (11283195).

Almost surely, 2^64475380 is an apocalyptic number.

It is an amenable number.

64475380 is an abundant number, since it is smaller than the sum of its proper divisors (70922960).

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

64475380 is a wasteful number, since it uses less digits than its factorization.

64475380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3223778 (or 3223776 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 37.

The square root of 64475380 is about 8029.6562815603. The cubic root of 64475380 is about 400.9879329623.

The spelling of 64475380 in words is "sixty-four million, four hundred seventy-five thousand, three hundred eighty".