72280919 has 2 divisors, whose sum is σ = 72280920. Its totient is φ = 72280918.

The previous prime is 72280903. The next prime is 72280937. The reversal of 72280919 is 91908227.

It is a weak prime.

It is an emirp because it is prime and its reverse (91908227) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72280919 - 2⁴ = 72280903 is a prime.

It is a super-2 number, since 2×72280919² = 10449062502969122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72280939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36140459 + 36140460.

It is an arithmetic number, because the mean of its divisors is an integer number (36140460).

Almost surely, 2^72280919 is an apocalyptic number.

72280919 is a deficient number, since it is larger than the sum of its proper divisors (1).

72280919 is an equidigital number, since it uses as much as digits as its factorization.

72280919 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 72280919 is about 8501.8185701649. The cubic root of 72280919 is about 416.5571134557.

The spelling of 72280919 in words is "seventy-two million, two hundred eighty thousand, nine hundred nineteen".