64405625 has 10 divisors (see below), whose sum is σ = 80482050. Its totient is φ = 51524000.

The previous prime is 64405613. The next prime is 64405633. The reversal of 64405625 is 52650446.

It can be written as a sum of positive squares in 5 ways, for example, as 32809984 + 31595641 = 5728^2 + 5621^2 .

It is not a de Polignac number, because 64405625 - 2⁴ = 64405609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64405591 and 64405600.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 50900 + ... + 52149.

It is an arithmetic number, because the mean of its divisors is an integer number (8048205).

Almost surely, 2^64405625 is an apocalyptic number.

It is an amenable number.

64405625 is a deficient number, since it is larger than the sum of its proper divisors (16076425).

64405625 is an equidigital number, since it uses as much as digits as its factorization.

64405625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103069 (or 103054 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 32.

The square root of 64405625 is about 8025.3115204333. The cubic root of 64405625 is about 400.8432730604.

The spelling of 64405625 in words is "sixty-four million, four hundred five thousand, six hundred twenty-five".