64496840 has 32 divisors (see below), whose sum is σ = 145515960. Its totient is φ = 25728000.

The previous prime is 64496821. The next prime is 64496851. The reversal of 64496840 is 4869446.

It can be written as a sum of positive squares in 4 ways, for example, as 55145476 + 9351364 = 7426^2 + 3058^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14030 + ... + 18050.

Almost surely, 2^64496840 is an apocalyptic number.

It is an amenable number.

64496840 is an abundant number, since it is smaller than the sum of its proper divisors (81019120).

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

64496840 is a wasteful number, since it uses less digits than its factorization.

64496840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4433 (or 4429 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 41.

The square root of 64496840 is about 8030.9924666880. The cubic root of 64496840 is about 401.0324163321.

The spelling of 64496840 in words is "sixty-four million, four hundred ninety-six thousand, eight hundred forty".