256767420 has 384 divisors, whose sum is σ = 960970752. Its totient is φ = 49766400.

The previous prime is 256767409. The next prime is 256767431. The reversal of 256767420 is 24767652.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (256767409) and next prime (256767431).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 6262600 + ... + 6262640.

It is an arithmetic number, because the mean of its divisors is an integer number (2502528).

Almost surely, 2^256767420 is an apocalyptic number.

256767420 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 256767420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (480485376).

256767420 is an abundant number, since it is smaller than the sum of its proper divisors (704203332).

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

256767420 is a wasteful number, since it uses less digits than its factorization.

256767420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141 (or 139 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 39.

The square root of 256767420 is about 16023.9639290657. The cubic root of 256767420 is about 635.5942687327.

The spelling of 256767420 in words is "two hundred fifty-six million, seven hundred sixty-seven thousand, four hundred twenty".