257720620 has 48 divisors (see below), whose sum is σ = 548523360. Its totient is φ = 101707776.

The previous prime is 257720563. The next prime is 257720621. The reversal of 257720620 is 26027752.

It is not an unprimeable number, because it can be changed into a prime (257720621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 690754 + ... + 691126.

It is an arithmetic number, because the mean of its divisors is an integer number (11427570).

Almost surely, 2^257720620 is an apocalyptic number.

257720620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

257720620 is an abundant number, since it is smaller than the sum of its proper divisors (290802740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

257720620 is a wasteful number, since it uses less digits than its factorization.

257720620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 754 (or 752 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 31.

The square root of 257720620 is about 16053.6793290510. The cubic root of 257720620 is about 636.3798049200.

The spelling of 257720620 in words is "two hundred fifty-seven million, seven hundred twenty thousand, six hundred twenty".