72393428505778 has 4 divisors (see below), whose sum is σ = 108590142758670. Its totient is φ = 36196714252888.

The previous prime is 72393428505763. The next prime is 72393428505799. The reversal of 72393428505778 is 87750582439327.

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., 65858467394329 + 6534961111449 = 8115323^2 + 2556357^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18098357126443 + ... + 18098357126446.

Almost surely, 2^{72393428505778} is an apocalyptic number.

72393428505778 is a deficient number, since it is larger than the sum of its proper divisors (36196714252892).

72393428505778 is a wasteful number, since it uses less digits than its factorization.

72393428505778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36196714252891.

The product of its (nonzero) digits is 711244800, while the sum is 70.

The spelling of 72393428505778 in words is "seventy-two trillion, three hundred ninety-three billion, four hundred twenty-eight million, five hundred five thousand, seven hundred seventy-eight".