255891390 has 32 divisors (see below), whose sum is σ = 616705056. Its totient is φ = 67952640.

The previous prime is 255891347. The next prime is 255891397. The reversal of 255891390 is 93198552.

It is a super-2 number, since 2×255891390² = 130960806952264200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255891397) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10467 + ... + 24926.

It is an arithmetic number, because the mean of its divisors is an integer number (19272033).

Almost surely, 2^255891390 is an apocalyptic number.

255891390 is an abundant number, since it is smaller than the sum of its proper divisors (360813666).

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

255891390 is a wasteful number, since it uses less digits than its factorization.

255891390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35644.

The product of its (nonzero) digits is 97200, while the sum is 42.

The square root of 255891390 is about 15996.6055774342. The cubic root of 255891390 is about 634.8706124457.

The spelling of 255891390 in words is "two hundred fifty-five million, eight hundred ninety-one thousand, three hundred ninety".