64766240 has 144 divisors (see below), whose sum is σ = 194431104. Its totient is φ = 20160000.

The previous prime is 64766203. The next prime is 64766291. The reversal of 64766240 is 4266746.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 64766240.

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, 85865 + ... + 86615.

It is an arithmetic number, because the mean of its divisors is an integer number (1350216).

Almost surely, 2^64766240 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64766240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97215552).

64766240 is an abundant number, since it is smaller than the sum of its proper divisors (129664864).

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

64766240 is a wasteful number, since it uses less digits than its factorization.

64766240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 791 (or 776 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 35.

The square root of 64766240 is about 8047.7475109499. The cubic root of 64766240 is about 401.5900046718.

The spelling of 64766240 in words is "sixty-four million, seven hundred sixty-six thousand, two hundred forty".