1625012878 has 4 divisors (see below), whose sum is σ = 2437519320. Its totient is φ = 812506438.

The previous prime is 1625012843. The next prime is 1625012903. The reversal of 1625012878 is 8782105261.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 1625012878.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406253218 + ... + 406253221.

It is an arithmetic number, because the mean of its divisors is an integer number (609379830).

Almost surely, 2^1625012878 is an apocalyptic number.

1625012878 is a deficient number, since it is larger than the sum of its proper divisors (812506442).

1625012878 is an equidigital number, since it uses as much as digits as its factorization.

1625012878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812506441.

The product of its (nonzero) digits is 53760, while the sum is 40.

The square root of 1625012878 is about 40311.4484731075. The cubic root of 1625012878 is about 1175.6704495433.

The spelling of 1625012878 in words is "one billion, six hundred twenty-five million, twelve thousand, eight hundred seventy-eight".