15625000 has 40 divisors (see below), whose sum is σ = 36621090. Its totient is φ = 6250000.

The previous prime is 15624979. The next prime is 15625007. The reversal of 15625000 is 52651.

It is a happy number.

The cubic root of 15625000 is 250.

It is a perfect power (a cube), and thus also a powerful number.

It can be written as a sum of positive squares in 5 ways, for example, as 14699556 + 925444 = 3834^2 + 962^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (15625007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 3124998 + ... + 3125002.

Almost surely, 2^15625000 is an apocalyptic number.

15625000 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 15625000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18310545).

15625000 is an abundant number, since it is smaller than the sum of its proper divisors (20996090).

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

15625000 is an frugal number, since it uses more digits than its factorization.

15625000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51 (or 7 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 15625000 is about 3952.8470752105.

Adding to 15625000 its reverse (52651), we get a palindrome (15677651).

The spelling of 15625000 in words is "fifteen million, six hundred twenty-five thousand".