256245100 has 18 divisors (see below), whose sum is σ = 556052084. Its totient is φ = 102498000.

The previous prime is 256245071. The next prime is 256245107. The reversal of 256245100 is 1542652.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (256245107) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1281126 + ... + 1281325.

Almost surely, 2^256245100 is an apocalyptic number.

256245100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256245100 is an abundant number, since it is smaller than the sum of its proper divisors (299806984).

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

256245100 is a wasteful number, since it uses less digits than its factorization.

256245100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2562465 (or 2562458 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 256245100 is about 16007.6575425638. The cubic root of 256245100 is about 635.1629978160.

Adding to 256245100 its reverse (1542652), we get a palindrome (257787752).

The spelling of 256245100 in words is "two hundred fifty-six million, two hundred forty-five thousand, one hundred".