66928625 has 16 divisors (see below), whose sum is σ = 83762640. Its totient is φ = 53392000.

The previous prime is 66928613. The next prime is 66928633. The reversal of 66928625 is 52682966.

It can be written as a sum of positive squares in 8 ways, for example, as 29669809 + 37258816 = 5447^2 + 6104^2 .

It is a de Polignac number, because none of the positive numbers 2^k-66928625 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70655 + ... + 71595.

It is an arithmetic number, because the mean of its divisors is an integer number (5235165).

Almost surely, 2^66928625 is an apocalyptic number.

It is an amenable number.

66928625 is a deficient number, since it is larger than the sum of its proper divisors (16834015).

66928625 is an equidigital number, since it uses as much as digits as its factorization.

66928625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1525 (or 1515 counting only the distinct ones).

The product of its digits is 311040, while the sum is 44.

The square root of 66928625 is about 8180.9916880535. The cubic root of 66928625 is about 406.0105334289.

The spelling of 66928625 in words is "sixty-six million, nine hundred twenty-eight thousand, six hundred twenty-five".