256794520 has 64 divisors (see below), whose sum is σ = 617997600. Its totient is φ = 95692800.

The previous prime is 256794493. The next prime is 256794523. The reversal of 256794520 is 25497652.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256794523) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 66811 + ... + 70549.

Almost surely, 2^256794520 is an apocalyptic number.

256794520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256794520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (308998800).

256794520 is an abundant number, since it is smaller than the sum of its proper divisors (361203080).

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

256794520 is a wasteful number, since it uses less digits than its factorization.

256794520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3868 (or 3864 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 40.

The square root of 256794520 is about 16024.8095152485. The cubic root of 256794520 is about 635.6166287849.

The spelling of 256794520 in words is "two hundred fifty-six million, seven hundred ninety-four thousand, five hundred twenty".