1278041625 has 128 divisors (see below), whose sum is σ = 2760376320. Its totient is φ = 571320000.

The previous prime is 1278041617. The next prime is 1278041651. The reversal of 1278041625 is 5261408721.

1278041625 is a `hidden beast` number, since 1 + 27 + 8 + 0 + 4 + 1 + 625 = 666.

It is not a de Polignac number, because 1278041625 - 2³ = 1278041617 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1278041625.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1109800 + ... + 1110950.

It is an arithmetic number, because the mean of its divisors is an integer number (21565440).

Almost surely, 2^1278041625 is an apocalyptic number.

1278041625 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1278041625 is an abundant number, since it is smaller than the sum of its proper divisors (1482334695).

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

1278041625 is a wasteful number, since it uses less digits than its factorization.

1278041625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1229 (or 1213 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 1278041625 is about 35749.7080407659. The cubic root of 1278041625 is about 1085.2130298719.

The spelling of 1278041625 in words is "one billion, two hundred seventy-eight million, forty-one thousand, six hundred twenty-five".