8725820621 has 4 divisors (see below), whose sum is σ = 9972366432. Its totient is φ = 7479274812.

The previous prime is 8725820599. The next prime is 8725820671. The reversal of 8725820621 is 1260285278.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8725820621 - 2⁶ = 8725820557 is a prime.

It is a super-2 number, since 2×8725820621² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8725820671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 623272895 + ... + 623272908.

It is an arithmetic number, because the mean of its divisors is an integer number (2493091608).

Almost surely, 2^8725820621 is an apocalyptic number.

It is an amenable number.

8725820621 is a deficient number, since it is larger than the sum of its proper divisors (1246545811).

8725820621 is a wasteful number, since it uses less digits than its factorization.

8725820621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1246545810.

The product of its (nonzero) digits is 107520, while the sum is 41.

The square root of 8725820621 is about 93412.1010415674. The cubic root of 8725820621 is about 2058.7428013320.

The spelling of 8725820621 in words is "eight billion, seven hundred twenty-five million, eight hundred twenty thousand, six hundred twenty-one".