8640792478 has 4 divisors (see below), whose sum is σ = 12961188720. Its totient is φ = 4320396238.

The previous prime is 8640792473. The next prime is 8640792481. The reversal of 8640792478 is 8742970468.

It is a happy number.

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

It is a super-2 number, since 2×8640792478² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8640792473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2160198118 + ... + 2160198121.

It is an arithmetic number, because the mean of its divisors is an integer number (3240297180).

Almost surely, 2^8640792478 is an apocalyptic number.

8640792478 is a deficient number, since it is larger than the sum of its proper divisors (4320396242).

8640792478 is a wasteful number, since it uses less digits than its factorization.

8640792478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4320396241.

The product of its (nonzero) digits is 5419008, while the sum is 55.

The square root of 8640792478 is about 92955.8630641446. The cubic root of 8640792478 is about 2052.0338710532.

The spelling of 8640792478 in words is "eight billion, six hundred forty million, seven hundred ninety-two thousand, four hundred seventy-eight".