1256172968 has 16 divisors (see below), whose sum is σ = 2457730080. Its totient is φ = 600778288.

The previous prime is 1256172947. The next prime is 1256172997. The reversal of 1256172968 is 8692716521.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3413330 + ... + 3413697.

It is an arithmetic number, because the mean of its divisors is an integer number (153608130).

Almost surely, 2^1256172968 is an apocalyptic number.

It is an amenable number.

1256172968 is a deficient number, since it is larger than the sum of its proper divisors (1201557112).

1256172968 is a wasteful number, since it uses less digits than its factorization.

1256172968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6827056 (or 6827052 counting only the distinct ones).

The product of its digits is 362880, while the sum is 47.

The square root of 1256172968 is about 35442.5304965658. The cubic root of 1256172968 is about 1078.9876682198.

The spelling of 1256172968 in words is "one billion, two hundred fifty-six million, one hundred seventy-two thousand, nine hundred sixty-eight".