257015220 has 96 divisors (see below), whose sum is σ = 897232896. Its totient is φ = 53404800.

The previous prime is 257015219. The next prime is 257015249. The reversal of 257015220 is 22510752.

It is a super-3 number, since 3×257015220³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23196 + ... + 32435.

It is an arithmetic number, because the mean of its divisors is an integer number (9346176).

Almost surely, 2^257015220 is an apocalyptic number.

257015220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

257015220 is an abundant number, since it is smaller than the sum of its proper divisors (640217676).

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

257015220 is a wasteful number, since it uses less digits than its factorization.

257015220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55661 (or 55659 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 24.

The square root of 257015220 is about 16031.6942336111. The cubic root of 257015220 is about 635.7986685230.

Adding to 257015220 its reverse (22510752), we get a palindrome (279525972).

The spelling of 257015220 in words is "two hundred fifty-seven million, fifteen thousand, two hundred twenty".