257797782 has 64 divisors (see below), whose sum is σ = 629925120. Its totient is φ = 77500800.

The previous prime is 257797781. The next prime is 257797801. The reversal of 257797782 is 287797752.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257797781) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 76158 + ... + 79470.

It is an arithmetic number, because the mean of its divisors is an integer number (9842580).

Almost surely, 2^257797782 is an apocalyptic number.

257797782 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 257797782, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (314962560).

257797782 is an abundant number, since it is smaller than the sum of its proper divisors (372127338).

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

257797782 is a wasteful number, since it uses less digits than its factorization.

257797782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3466 (or 3460 counting only the distinct ones).

The product of its digits is 3457440, while the sum is 54.

The square root of 257797782 is about 16056.0823988917. The cubic root of 257797782 is about 636.4433096546.

The spelling of 257797782 in words is "two hundred fifty-seven million, seven hundred ninety-seven thousand, seven hundred eighty-two".