8721387025 has 24 divisors (see below), whose sum is σ = 11753301560. Its totient is φ = 6381296640.

The previous prime is 8721387023. The next prime is 8721387047. The reversal of 8721387025 is 5207831278.

It can be written as a sum of positive squares in 12 ways, for example, as 2378220289 + 6343166736 = 48767^2 + 79644^2 .

It is not a de Polignac number, because 8721387025 - 2¹ = 8721387023 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8721387023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 87672 + ... + 158521.

Almost surely, 2^8721387025 is an apocalyptic number.

It is an amenable number.

8721387025 is a deficient number, since it is larger than the sum of its proper divisors (3031914535).

8721387025 is a wasteful number, since it uses less digits than its factorization.

8721387025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246325 (or 246320 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 43.

The square root of 8721387025 is about 93388.3666470294. The cubic root of 8721387025 is about 2058.3940593396.

The spelling of 8721387025 in words is "eight billion, seven hundred twenty-one million, three hundred eighty-seven thousand, twenty-five".