64440492 has 12 divisors (see below), whose sum is σ = 150361176. Its totient is φ = 21480160.

The previous prime is 64440491. The next prime is 64440517. The reversal of 64440492 is 29404446.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (64440491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2685009 + ... + 2685032.

It is an arithmetic number, because the mean of its divisors is an integer number (12530098).

Almost surely, 2^64440492 is an apocalyptic number.

It is an amenable number.

64440492 is an abundant number, since it is smaller than the sum of its proper divisors (85920684).

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

64440492 is a wasteful number, since it uses less digits than its factorization.

64440492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5370048 (or 5370046 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 33.

The square root of 64440492 is about 8027.4835409361. The cubic root of 64440492 is about 400.9155942854.

The spelling of 64440492 in words is "sixty-four million, four hundred forty thousand, four hundred ninety-two".