257861010 has 32 divisors (see below), whose sum is σ = 675127872. Its totient is φ = 62511680.

The previous prime is 257860991. The next prime is 257861053. The reversal of 257861010 is 10168752.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 390369 + ... + 391028.

It is an arithmetic number, because the mean of its divisors is an integer number (21097746).

Almost surely, 2^257861010 is an apocalyptic number.

257861010 is an abundant number, since it is smaller than the sum of its proper divisors (417266862).

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

257861010 is a wasteful number, since it uses less digits than its factorization.

257861010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 781418.

The product of its (nonzero) digits is 3360, while the sum is 30.

The square root of 257861010 is about 16058.0512516308. The cubic root of 257861010 is about 636.4953371880.

It can be divided in two parts, 25786 and 1010, that added together give a triangular number (26796 = T₂₃₁).

The spelling of 257861010 in words is "two hundred fifty-seven million, eight hundred sixty-one thousand, ten".