72615377 has 2 divisors, whose sum is σ = 72615378. Its totient is φ = 72615376.

The previous prime is 72615373. The next prime is 72615379. The reversal of 72615377 is 77351627.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44302336 + 28313041 = 6656^2 + 5321^2 .

It is a cyclic number.

It is not a de Polignac number, because 72615377 - 2² = 72615373 is a prime.

Together with 72615379, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72615377.

It is not a weakly prime, because it can be changed into another prime (72615373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36307688 + 36307689.

It is an arithmetic number, because the mean of its divisors is an integer number (36307689).

Almost surely, 2^72615377 is an apocalyptic number.

It is an amenable number.

72615377 is a deficient number, since it is larger than the sum of its proper divisors (1).

72615377 is an equidigital number, since it uses as much as digits as its factorization.

72615377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61740, while the sum is 38.

The square root of 72615377 is about 8521.4656603192. The cubic root of 72615377 is about 417.1986221847.

The spelling of 72615377 in words is "seventy-two million, six hundred fifteen thousand, three hundred seventy-seven".