72988777 has 2 divisors, whose sum is σ = 72988778. Its totient is φ = 72988776.

The previous prime is 72988763. The next prime is 72988807. The reversal of 72988777 is 77788927.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72318016 + 670761 = 8504^2 + 819^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72988777 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (72980777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36494388 + 36494389.

It is an arithmetic number, because the mean of its divisors is an integer number (36494389).

Almost surely, 2^72988777 is an apocalyptic number.

It is an amenable number.

72988777 is a deficient number, since it is larger than the sum of its proper divisors (1).

72988777 is an equidigital number, since it uses as much as digits as its factorization.

72988777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2765952, while the sum is 55.

The square root of 72988777 is about 8543.3469436749. The cubic root of 72988777 is about 417.9125008583.

The spelling of 72988777 in words is "seventy-two million, nine hundred eighty-eight thousand, seven hundred seventy-seven".