72810971 has 4 divisors (see below), whose sum is σ = 75159744. Its totient is φ = 70462200.

The previous prime is 72810961. The next prime is 72811007. The reversal of 72810971 is 17901827.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72810971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72810901) 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 in 3 ways as a sum of consecutive naturals, for example, 1174340 + ... + 1174401.

It is an arithmetic number, because the mean of its divisors is an integer number (18789936).

Almost surely, 2^72810971 is an apocalyptic number.

72810971 is a deficient number, since it is larger than the sum of its proper divisors (2348773).

72810971 is a wasteful number, since it uses less digits than its factorization.

72810971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2348772.

The product of its (nonzero) digits is 7056, while the sum is 35.

The square root of 72810971 is about 8532.9344893770. The cubic root of 72810971 is about 417.5728697792.

The spelling of 72810971 in words is "seventy-two million, eight hundred ten thousand, nine hundred seventy-one".