8378910521 has 8 divisors (see below), whose sum is σ = 8671276800. Its totient is φ = 8086773520.

The previous prime is 8378910493. The next prime is 8378910523. The reversal of 8378910521 is 1250198738.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8378910521 - 2⁶ = 8378910457 is a prime.

It is a super-2 number, since 2×8378910521² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8378910523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18776 + ... + 130806.

It is an arithmetic number, because the mean of its divisors is an integer number (1083909600).

Almost surely, 2^8378910521 is an apocalyptic number.

It is an amenable number.

8378910521 is a deficient number, since it is larger than the sum of its proper divisors (292366279).

8378910521 is a wasteful number, since it uses less digits than its factorization.

8378910521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114639.

The product of its (nonzero) digits is 120960, while the sum is 44.

The square root of 8378910521 is about 91536.3890537528. The cubic root of 8378910521 is about 2031.0900760486.

The spelling of 8378910521 in words is "eight billion, three hundred seventy-eight million, nine hundred ten thousand, five hundred twenty-one".