646058725 has 12 divisors (see below), whose sum is σ = 862737316. Its totient is φ = 477089280.

The previous prime is 646058717. The next prime is 646058731. The reversal of 646058725 is 527850646.

It can be written as a sum of positive squares in 6 ways, for example, as 152819044 + 493239681 = 12362^2 + 22209^2 .

It is not a de Polignac number, because 646058725 - 2³ = 646058717 is a prime.

It is a super-2 number, since 2×646058725² = 834783752297251250, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 993612 + ... + 994261.

Almost surely, 2^646058725 is an apocalyptic number.

646058725 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

646058725 is a deficient number, since it is larger than the sum of its proper divisors (216678591).

646058725 is a wasteful number, since it uses less digits than its factorization.

646058725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1987896 (or 1987891 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 43.

The square root of 646058725 is about 25417.6852801352. The cubic root of 646058725 is about 864.4847410809.

The spelling of 646058725 in words is "six hundred forty-six million, fifty-eight thousand, seven hundred twenty-five".