64503540 has 120 divisors (see below), whose sum is σ = 209480040. Its totient is φ = 16595712.

The previous prime is 64503539. The next prime is 64503563. The reversal of 64503540 is 4530546.

It can be written as a sum of positive squares in 4 ways, for example, as 25040016 + 39463524 = 5004^2 + 6282^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 46294 + ... + 47666.

It is an arithmetic number, because the mean of its divisors is an integer number (1745667).

Almost surely, 2^64503540 is an apocalyptic number.

64503540 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 64503540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104740020).

64503540 is an abundant number, since it is smaller than the sum of its proper divisors (144976500).

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

64503540 is a wasteful number, since it uses less digits than its factorization.

64503540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1423 (or 1412 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 64503540 is about 8031.4095898541. The cubic root of 64503540 is about 401.0463024085.

The spelling of 64503540 in words is "sixty-four million, five hundred three thousand, five hundred forty".