64503025 has 24 divisors (see below), whose sum is σ = 82907640. Its totient is φ = 49743360.

The previous prime is 64503013. The next prime is 64503037. The reversal of 64503025 is 52030546.

It is an interprime number because it is at equal distance from previous prime (64503013) and next prime (64503037).

It can be written as a sum of positive squares in 12 ways, for example, as 567009 + 63936016 = 753^2 + 7996^2 .

It is not a de Polignac number, because 64503025 - 2⁷ = 64502897 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

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, 126471 + ... + 126979.

It is an arithmetic number, because the mean of its divisors is an integer number (3454485).

Almost surely, 2^64503025 is an apocalyptic number.

It is an amenable number.

64503025 is a deficient number, since it is larger than the sum of its proper divisors (18404615).

64503025 is a wasteful number, since it uses less digits than its factorization.

64503025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693 (or 688 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 64503025 is about 8031.3775281704. The cubic root of 64503025 is about 401.0452350800.

The spelling of 64503025 in words is "sixty-four million, five hundred three thousand, twenty-five".