72978377 has 2 divisors, whose sum is σ = 72978378. Its totient is φ = 72978376.

The previous prime is 72978329. The next prime is 72978419. The reversal of 72978377 is 77387927.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43612816 + 29365561 = 6604^2 + 5419^2 .

It is a cyclic number.

It is not a de Polignac number, because 72978377 - 2¹² = 72974281 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (72978307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36489188 + 36489189.

It is an arithmetic number, because the mean of its divisors is an integer number (36489189).

Almost surely, 2^72978377 is an apocalyptic number.

It is an amenable number.

72978377 is a deficient number, since it is larger than the sum of its proper divisors (1).

72978377 is an equidigital number, since it uses as much as digits as its factorization.

72978377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1037232, while the sum is 50.

The square root of 72978377 is about 8542.7382612369. The cubic root of 72978377 is about 417.8926507908.

The spelling of 72978377 in words is "seventy-two million, nine hundred seventy-eight thousand, three hundred seventy-seven".