1297765632 has 72 divisors (see below), whose sum is σ = 3519228384. Its totient is φ = 424413184.

The previous prime is 1297765597. The next prime is 1297765633. The reversal of 1297765632 is 2365677921.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1297765633) 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, 24763 + ... + 56645.

It is an arithmetic number, because the mean of its divisors is an integer number (48878172).

Almost surely, 2^1297765632 is an apocalyptic number.

1297765632 is a gapful number since it is divisible by the number (12) 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 1297765632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1759614192).

1297765632 is an abundant number, since it is smaller than the sum of its proper divisors (2221462752).

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

1297765632 is an equidigital number, since it uses as much as digits as its factorization.

1297765632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31955 (or 31941 counting only the distinct ones).

The product of its digits is 952560, while the sum is 48.

The square root of 1297765632 is about 36024.5143201126. The cubic root of 1297765632 is about 1090.7672492755.

The spelling of 1297765632 in words is "one billion, two hundred ninety-seven million, seven hundred sixty-five thousand, six hundred thirty-two".