256215750 has 128 divisors (see below), whose sum is σ = 751196160. Its totient is φ = 56937600.

The previous prime is 256215719. The next prime is 256215797. The reversal of 256215750 is 57512652.

256215750 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 193591 + ... + 194909.

It is an arithmetic number, because the mean of its divisors is an integer number (5868720).

Almost surely, 2^256215750 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256215750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (375598080).

256215750 is an abundant number, since it is smaller than the sum of its proper divisors (494980410).

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

256215750 is a wasteful number, since it uses less digits than its factorization.

256215750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1383 (or 1373 counting only the distinct ones).

The product of its (nonzero) digits is 21000, while the sum is 33.

The square root of 256215750 is about 16006.7407675641. The cubic root of 256215750 is about 635.1387466261.

The spelling of 256215750 in words is "two hundred fifty-six million, two hundred fifteen thousand, seven hundred fifty".