64440276 has 24 divisors (see below), whose sum is σ = 151129440. Its totient is φ = 21370272.

The previous prime is 64440269. The next prime is 64440281. The reversal of 64440276 is 67204446.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11266 + ... + 15993.

It is an arithmetic number, because the mean of its divisors is an integer number (6297060).

Almost surely, 2^64440276 is an apocalyptic number.

It is an amenable number.

64440276 is an abundant number, since it is smaller than the sum of its proper divisors (86689164).

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

64440276 is a wasteful number, since it uses less digits than its factorization.

64440276 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27463 (or 27461 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 33.

The square root of 64440276 is about 8027.4700871445. The cubic root of 64440276 is about 400.9151463379.

The spelling of 64440276 in words is "sixty-four million, four hundred forty thousand, two hundred seventy-six".