72278755249 has 4 divisors (see below), whose sum is σ = 72279293040. Its totient is φ = 72278217460.

The previous prime is 72278755231. The next prime is 72278755253. The reversal of 72278755249 is 94255787227.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 72278755249 - 2⁵ = 72278755217 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72278755193 and 72278755202.

It is not an unprimeable number, because it can be changed into a prime (72278755349) 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, 126834 + ... + 400804.

It is an arithmetic number, because the mean of its divisors is an integer number (18069823260).

Almost surely, 2^72278755249 is an apocalyptic number.

It is an amenable number.

72278755249 is a deficient number, since it is larger than the sum of its proper divisors (537791).

72278755249 is a wasteful number, since it uses less digits than its factorization.

72278755249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537790.

The product of its digits is 19756800, while the sum is 58.

The spelling of 72278755249 in words is "seventy-two billion, two hundred seventy-eight million, seven hundred fifty-five thousand, two hundred forty-nine".