64905725 has 6 divisors (see below), whose sum is σ = 80483130. Its totient is φ = 51924560.

The previous prime is 64905721. The next prime is 64905727. The reversal of 64905725 is 52750946.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 38809 + 64866916 = 197^2 + 8054^2 .

It is not a de Polignac number, because 64905725 - 2² = 64905721 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64905721) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1298090 + ... + 1298139.

It is an arithmetic number, because the mean of its divisors is an integer number (13413855).

Almost surely, 2^64905725 is an apocalyptic number.

It is an amenable number.

64905725 is a deficient number, since it is larger than the sum of its proper divisors (15577405).

64905725 is a wasteful number, since it uses less digits than its factorization.

64905725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2596239 (or 2596234 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 38.

The square root of 64905725 is about 8056.4089394717. The cubic root of 64905725 is about 401.8780951786.

The spelling of 64905725 in words is "sixty-four million, nine hundred five thousand, seven hundred twenty-five".