1275550000 has 120 divisors (see below), whose sum is σ = 3132736992. Its totient is φ = 503040000.

The previous prime is 1275549983. The next prime is 1275550033. The reversal of 1275550000 is 555721.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4849869 + ... + 4850131.

Almost surely, 2^1275550000 is an apocalyptic number.

1275550000 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 1275550000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1566368496).

1275550000 is an abundant number, since it is smaller than the sum of its proper divisors (1857186992).

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

1275550000 is an frugal number, since it uses more digits than its factorization.

1275550000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393 (or 367 counting only the distinct ones).

The product of its (nonzero) digits is 1750, while the sum is 25.

The square root of 1275550000 is about 35714.8428527972. The cubic root of 1275550000 is about 1084.5073400259.

The spelling of 1275550000 in words is "one billion, two hundred seventy-five million, five hundred fifty thousand".