64497240 has 96 divisors (see below), whose sum is σ = 211891680. Its totient is φ = 17012736.

The previous prime is 64497239. The next prime is 64497263. The reversal of 64497240 is 4279446.

64497240 is a `hidden beast` number, since 644 + 9 + 7 + 2 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 64497195 and 64497204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33997 + ... + 35843.

It is an arithmetic number, because the mean of its divisors is an integer number (2207205).

Almost surely, 2^64497240 is an apocalyptic number.

64497240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64497240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105945840).

64497240 is an abundant number, since it is smaller than the sum of its proper divisors (147394440).

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

64497240 is a wasteful number, since it uses less digits than its factorization.

64497240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1961 (or 1954 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 64497240 is about 8031.0173701717. The cubic root of 64497240 is about 401.0332453785.

It can be divided in two parts, 6449 and 7240, that added together give a square (13689 = 117²).

The spelling of 64497240 in words is "sixty-four million, four hundred ninety-seven thousand, two hundred forty".