64363540 has 24 divisors (see below), whose sum is σ = 137381832. Its totient is φ = 25322880.

The previous prime is 64363531. The next prime is 64363577. The reversal of 64363540 is 4536346.

It can be written as a sum of positive squares in 4 ways, for example, as 3429904 + 60933636 = 1852^2 + 7806^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25159 + ... + 27598.

It is an arithmetic number, because the mean of its divisors is an integer number (5724243).

Almost surely, 2^64363540 is an apocalyptic number.

It is an amenable number.

64363540 is an abundant number, since it is smaller than the sum of its proper divisors (73018292).

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

64363540 is a wasteful number, since it uses less digits than its factorization.

64363540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52827 (or 52825 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 31.

The square root of 64363540 is about 8022.6890753662. The cubic root of 64363540 is about 400.7559454662.

Adding to 64363540 its reverse (4536346), we get a palindrome (68899886).

The spelling of 64363540 in words is "sixty-four million, three hundred sixty-three thousand, five hundred forty".