1256266004 has 24 divisors (see below), whose sum is σ = 2513589120. Its totient is φ = 538173216.

The previous prime is 1256266001. The next prime is 1256266007. The reversal of 1256266004 is 4006626521.

It is an interprime number because it is at equal distance from previous prime (1256266001) and next prime (1256266007).

It is a super-2 number, since 2×1256266004² = 3156408545612256032, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256266001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70049 + ... + 86135.

It is an arithmetic number, because the mean of its divisors is an integer number (104732880).

Almost surely, 2^1256266004 is an apocalyptic number.

1256266004 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1256266004 is an abundant number, since it is smaller than the sum of its proper divisors (1257323116).

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

1256266004 is a wasteful number, since it uses less digits than its factorization.

1256266004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18887 (or 18885 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 1256266004 is about 35443.8429632003. The cubic root of 1256266004 is about 1079.0143052677.

The spelling of 1256266004 in words is "one billion, two hundred fifty-six million, two hundred sixty-six thousand, four".