1275217620 has 24 divisors (see below), whose sum is σ = 3570609504. Its totient is φ = 340058016.

The previous prime is 1275217613. The next prime is 1275217637. The reversal of 1275217620 is 267125721.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10626754 + ... + 10626873.

It is an arithmetic number, because the mean of its divisors is an integer number (148775396).

Almost surely, 2^1275217620 is an apocalyptic number.

1275217620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1275217620 is an abundant number, since it is smaller than the sum of its proper divisors (2295391884).

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

1275217620 is a wasteful number, since it uses less digits than its factorization.

1275217620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21253639 (or 21253637 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 33.

The square root of 1275217620 is about 35710.1893022146. The cubic root of 1275217620 is about 1084.4131323340.

The spelling of 1275217620 in words is "one billion, two hundred seventy-five million, two hundred seventeen thousand, six hundred twenty".