72919877 has 2 divisors, whose sum is σ = 72919878. Its totient is φ = 72919876.

The previous prime is 72919841. The next prime is 72919897. The reversal of 72919877 is 77891927.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67092481 + 5827396 = 8191^2 + 2414^2 .

It is a cyclic number.

It is not a de Polignac number, because 72919877 - 2¹² = 72915781 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72919807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36459938 + 36459939.

It is an arithmetic number, because the mean of its divisors is an integer number (36459939).

Almost surely, 2^72919877 is an apocalyptic number.

It is an amenable number.

72919877 is a deficient number, since it is larger than the sum of its proper divisors (1).

72919877 is an equidigital number, since it uses as much as digits as its factorization.

72919877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 444528, while the sum is 50.

The square root of 72919877 is about 8539.3136141027. The cubic root of 72919877 is about 417.7809590075.

The spelling of 72919877 in words is "seventy-two million, nine hundred nineteen thousand, eight hundred seventy-seven".