72997759 has 4 divisors (see below), whose sum is σ = 73368504. Its totient is φ = 72627016.

The previous prime is 72997751. The next prime is 72997763. The reversal of 72997759 is 95779927.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72997759 - 2³ = 72997751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72997751) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 185077 + ... + 185470.

It is an arithmetic number, because the mean of its divisors is an integer number (18342126).

Almost surely, 2^72997759 is an apocalyptic number.

72997759 is a deficient number, since it is larger than the sum of its proper divisors (370745).

72997759 is a wasteful number, since it uses less digits than its factorization.

72997759 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370744.

The product of its digits is 2500470, while the sum is 55.

The square root of 72997759 is about 8543.8725997056. The cubic root of 72997759 is about 417.9296429281.

The spelling of 72997759 in words is "seventy-two million, nine hundred ninety-seven thousand, seven hundred fifty-nine".