72278304946 has 4 divisors (see below), whose sum is σ = 108417457422. Its totient is φ = 36139152472.

The previous prime is 72278304911. The next prime is 72278304979. The reversal of 72278304946 is 64940387227.

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

It can be written as a sum of positive squares in only one way, i.e., 71446617025 + 831687921 = 267295^2 + 28839^2 .

It is a junction number, because it is equal to n+sod(n) for n = 72278304893 and 72278304902.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18069576235 + ... + 18069576238.

Almost surely, 2^72278304946 is an apocalyptic number.

72278304946 is a deficient number, since it is larger than the sum of its proper divisors (36139152476).

72278304946 is a wasteful number, since it uses less digits than its factorization.

72278304946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36139152475.

The product of its (nonzero) digits is 4064256, while the sum is 52.

The spelling of 72278304946 in words is "seventy-two billion, two hundred seventy-eight million, three hundred four thousand, nine hundred forty-six".