64275440 has 20 divisors (see below), whose sum is σ = 149440584. Its totient is φ = 25710144.

The previous prime is 64275433. The next prime is 64275451. The reversal of 64275440 is 4457246.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 64275397 and 64275406.

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, 401642 + ... + 401801.

Almost surely, 2^64275440 is an apocalyptic number.

It is an amenable number.

64275440 is an abundant number, since it is smaller than the sum of its proper divisors (85165144).

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

64275440 is a wasteful number, since it uses less digits than its factorization.

64275440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 803456 (or 803450 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 32.

The square root of 64275440 is about 8017.1965174866. The cubic root of 64275440 is about 400.5730120842.

The spelling of 64275440 in words is "sixty-four million, two hundred seventy-five thousand, four hundred forty".