64500240 has 80 divisors (see below), whose sum is σ = 228521088. Its totient is φ = 14742528.

The previous prime is 64500239. The next prime is 64500251. The reversal of 64500240 is 4200546.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17517 + ... + 20876.

Almost surely, 2^64500240 is an apocalyptic number.

64500240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64500240 is an abundant number, since it is smaller than the sum of its proper divisors (164020848).

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

64500240 is a wasteful number, since it uses less digits than its factorization.

64500240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38416 (or 38410 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 64500240 is about 8031.2041438380. The cubic root of 64500240 is about 401.0394631179.

Adding to 64500240 its reverse (4200546), we get a palindrome (68700786).

The spelling of 64500240 in words is "sixty-four million, five hundred thousand, two hundred forty".