10172228978 has 6 divisors (see below), whose sum is σ = 15258557421. Its totient is φ = 5086043172.

The previous prime is 10172228977. The next prime is 10172228981. The reversal of 10172228978 is 87982227101.

It can be written as a sum of positive squares in 2 ways, for example, as 9469819969 + 702409009 = 97313^2 + 26503^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=71317.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10172228977) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 106976 + ... + 178292.

Almost surely, 2^10172228978 is an apocalyptic number.

10172228978 is a deficient number, since it is larger than the sum of its proper divisors (5086328443).

10172228978 is an frugal number, since it uses more digits than its factorization.

10172228978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142636 (or 71319 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 47.

The spelling of 10172228978 in words is "ten billion, one hundred seventy-two million, two hundred twenty-eight thousand, nine hundred seventy-eight".