256069770 has 64 divisors (see below), whose sum is σ = 672015744. Its totient is φ = 61931520.

The previous prime is 256069769. The next prime is 256069789. The reversal of 256069770 is 77960652.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 221514 + ... + 222666.

It is an arithmetic number, because the mean of its divisors is an integer number (10500246).

Almost surely, 2^256069770 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256069770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (336007872).

256069770 is an abundant number, since it is smaller than the sum of its proper divisors (415945974).

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

256069770 is a wasteful number, since it uses less digits than its factorization.

256069770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1847.

The product of its (nonzero) digits is 158760, while the sum is 42.

The square root of 256069770 is about 16002.1801639652. The cubic root of 256069770 is about 635.0180993870.

The spelling of 256069770 in words is "two hundred fifty-six million, sixty-nine thousand, seven hundred seventy".