64308725 has 36 divisors (see below), whose sum is σ = 89315712. Its totient is φ = 45864000.

The previous prime is 64308719. The next prime is 64308731. The reversal of 64308725 is 52780346.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (64308719) and next prime (64308731).

It is not a de Polignac number, because 64308725 - 2⁴ = 64308709 is a prime.

It is a super-2 number, since 2×64308725² = 8271224222251250, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 130730 + ... + 131220.

It is an arithmetic number, because the mean of its divisors is an integer number (2480992).

Almost surely, 2^64308725 is an apocalyptic number.

64308725 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

64308725 is a deficient number, since it is larger than the sum of its proper divisors (25006987).

64308725 is a wasteful number, since it uses less digits than its factorization.

64308725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558 (or 540 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 64308725 is about 8019.2720991372. The cubic root of 64308725 is about 400.6421456541.

The spelling of 64308725 in words is "sixty-four million, three hundred eight thousand, seven hundred twenty-five".