1279252128 has 96 divisors (see below), whose sum is σ = 4186667520. Its totient is φ = 332271360.

The previous prime is 1279252123. The next prime is 1279252129. The reversal of 1279252128 is 8212529721.

It is a tau number, because it is divible by the number of its divisors (96).

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1279252123) 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, 79138 + ... + 93921.

It is an arithmetic number, because the mean of its divisors is an integer number (43611120).

Almost surely, 2^1279252128 is an apocalyptic number.

It is an amenable number.

1279252128 is an abundant number, since it is smaller than the sum of its proper divisors (2907415392).

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

1279252128 is a wasteful number, since it uses less digits than its factorization.

1279252128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173090 (or 173082 counting only the distinct ones).

The product of its digits is 40320, while the sum is 39.

The square root of 1279252128 is about 35766.6342839245. The cubic root of 1279252128 is about 1085.5555432602. Note that the first 4 decimals are identical.

The spelling of 1279252128 in words is "one billion, two hundred seventy-nine million, two hundred fifty-two thousand, one hundred twenty-eight".