1290725550 has 96 divisors (see below), whose sum is σ = 3588564960. Its totient is φ = 341107200.

The previous prime is 1290725531. The next prime is 1290725593. The reversal of 1290725550 is 555270921.

1290725550 is a `hidden beast` number, since 12 + 90 + 7 + 2 + 5 + 550 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 148320 + ... + 156780.

It is an arithmetic number, because the mean of its divisors is an integer number (37380885).

Almost surely, 2^1290725550 is an apocalyptic number.

1290725550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1290725550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1794282480).

1290725550 is an abundant number, since it is smaller than the sum of its proper divisors (2297839410).

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

1290725550 is a wasteful number, since it uses less digits than its factorization.

1290725550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8595 (or 8584 counting only the distinct ones).

The product of its (nonzero) digits is 31500, while the sum is 36.

The square root of 1290725550 is about 35926.6690635244. The cubic root of 1290725550 is about 1088.7912842118.

The spelling of 1290725550 in words is "one billion, two hundred ninety million, seven hundred twenty-five thousand, five hundred fifty".