1297750628 has 6 divisors (see below), whose sum is σ = 2271063606. Its totient is φ = 648875312.

The previous prime is 1297750591. The next prime is 1297750631. The reversal of 1297750628 is 8260577921.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1269639424 + 28111204 = 35632^2 + 5302^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 162218825 + ... + 162218832.

It is an arithmetic number, because the mean of its divisors is an integer number (378510601).

Almost surely, 2^1297750628 is an apocalyptic number.

It is an amenable number.

1297750628 is a deficient number, since it is larger than the sum of its proper divisors (973312978).

1297750628 is a wasteful number, since it uses less digits than its factorization.

1297750628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324437661 (or 324437659 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 47.

The square root of 1297750628 is about 36024.3060724284. The cubic root of 1297750628 is about 1090.7630456570.

The spelling of 1297750628 in words is "one billion, two hundred ninety-seven million, seven hundred fifty thousand, six hundred twenty-eight".