72770273 has 4 divisors (see below), whose sum is σ = 73520580. Its totient is φ = 72019968.

The previous prime is 72770267. The next prime is 72770287. The reversal of 72770273 is 37207727.

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

It can be written as a sum of positive squares in 2 ways, for example, as 53699584 + 19070689 = 7328^2 + 4367^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72770273 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (72770213) 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, 375008 + ... + 375201.

It is an arithmetic number, because the mean of its divisors is an integer number (18380145).

Almost surely, 2^72770273 is an apocalyptic number.

It is an amenable number.

72770273 is a deficient number, since it is larger than the sum of its proper divisors (750307).

72770273 is an equidigital number, since it uses as much as digits as its factorization.

72770273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 750306.

The product of its (nonzero) digits is 28812, while the sum is 35.

The square root of 72770273 is about 8530.5493961409. The cubic root of 72770273 is about 417.4950539053.

The spelling of 72770273 in words is "seventy-two million, seven hundred seventy thousand, two hundred seventy-three".