257877378 has 96 divisors (see below), whose sum is σ = 641208960. Its totient is φ = 76744800.

The previous prime is 257877343. The next prime is 257877379. The reversal of 257877378 is 873778752.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (257877379) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 398251 + ... + 398897.

It is an arithmetic number, because the mean of its divisors is an integer number (6679260).

Almost surely, 2^257877378 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 257877378, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (320604480).

257877378 is an abundant number, since it is smaller than the sum of its proper divisors (383331582).

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

257877378 is a wasteful number, since it uses less digits than its factorization.

257877378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 741 (or 724 counting only the distinct ones).

The product of its digits is 4609920, while the sum is 54.

The square root of 257877378 is about 16058.5608944264. The cubic root of 257877378 is about 636.5088043077.

The spelling of 257877378 in words is "two hundred fifty-seven million, eight hundred seventy-seven thousand, three hundred seventy-eight".