64503140 has 24 divisors (see below), whose sum is σ = 145876920. Its totient is φ = 23816448.

The previous prime is 64503137. The next prime is 64503181. The reversal of 64503140 is 4130546.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3912484 + 60590656 = 1978^2 + 7784^2 .

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, 123785 + ... + 124304.

It is an arithmetic number, because the mean of its divisors is an integer number (6078205).

Almost surely, 2^64503140 is an apocalyptic number.

It is an amenable number.

64503140 is an abundant number, since it is smaller than the sum of its proper divisors (81373780).

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

64503140 is a wasteful number, since it uses less digits than its factorization.

64503140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248111 (or 248109 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 64503140 is about 8031.3846875866. The cubic root of 64503140 is about 401.0454734160.

Adding to 64503140 its reverse (4130546), we get a palindrome (68633686).

The spelling of 64503140 in words is "sixty-four million, five hundred three thousand, one hundred forty".