1525778672 has 80 divisors (see below), whose sum is σ = 3343928832. Its totient is φ = 668405760.

The previous prime is 1525778663. The next prime is 1525778687. The reversal of 1525778672 is 2768775251.

It is a self number, because there is not a number n which added to its sum of digits gives 1525778672.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 552848 + ... + 555600.

Almost surely, 2^1525778672 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1525778672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1671964416).

1525778672 is an abundant number, since it is smaller than the sum of its proper divisors (1818150160).

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

1525778672 is a wasteful number, since it uses less digits than its factorization.

1525778672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2886 (or 2880 counting only the distinct ones).

The product of its digits is 1646400, while the sum is 50.

The square root of 1525778672 is about 39061.2169805294. The cubic root of 1525778672 is about 1151.2346342050.

The spelling of 1525778672 in words is "one billion, five hundred twenty-five million, seven hundred seventy-eight thousand, six hundred seventy-two".