1295721888 has 48 divisors (see below), whose sum is σ = 3426131520. Its totient is φ = 428750336.

The previous prime is 1295721883. The next prime is 1295721919. The reversal of 1295721888 is 8881275921.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×1295721888² = 3357790422084569088, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1295721888.

It is not an unprimeable number, because it can be changed into a prime (1295721883) 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, 36108 + ... + 62411.

It is an arithmetic number, because the mean of its divisors is an integer number (71377740).

Almost surely, 2^1295721888 is an apocalyptic number.

It is an amenable number.

1295721888 is an abundant number, since it is smaller than the sum of its proper divisors (2130409632).

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

1295721888 is a wasteful number, since it uses less digits than its factorization.

1295721888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98669 (or 98661 counting only the distinct ones).

The product of its digits is 645120, while the sum is 51.

The square root of 1295721888 is about 35996.1371260862. The cubic root of 1295721888 is about 1090.1943619962.

The spelling of 1295721888 in words is "one billion, two hundred ninety-five million, seven hundred twenty-one thousand, eight hundred eighty-eight".