1297648880 has 80 divisors (see below), whose sum is σ = 3299788800. Its totient is φ = 470657280.

The previous prime is 1297648823. The next prime is 1297648901. The reversal of 1297648880 is 888467921.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 384641 + ... + 387999.

It is an arithmetic number, because the mean of its divisors is an integer number (41247360).

Almost surely, 2^1297648880 is an apocalyptic number.

1297648880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1297648880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1649894400).

1297648880 is an abundant number, since it is smaller than the sum of its proper divisors (2002139920).

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

1297648880 is a wasteful number, since it uses less digits than its factorization.

1297648880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3822 (or 3816 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 53.

The square root of 1297648880 is about 36022.8938315622. The cubic root of 1297648880 is about 1090.7345384188.

The spelling of 1297648880 in words is "one billion, two hundred ninety-seven million, six hundred forty-eight thousand, eight hundred eighty".