72056437 has 4 divisors (see below), whose sum is σ = 72109996. Its totient is φ = 72002880.

The previous prime is 72056381. The next prime is 72056473. The reversal of 72056437 is 73465027.

It is a happy number.

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 10182481 + 61873956 = 3191^2 + 7866^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72056437 is a prime.

It is a super-2 number, since 2×72056437² = 10384260226269938, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72056497) 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, 24708 + ... + 27469.

It is an arithmetic number, because the mean of its divisors is an integer number (18027499).

Almost surely, 2^72056437 is an apocalyptic number.

It is an amenable number.

72056437 is a deficient number, since it is larger than the sum of its proper divisors (53559).

72056437 is a wasteful number, since it uses less digits than its factorization.

72056437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53558.

The product of its (nonzero) digits is 35280, while the sum is 34.

The square root of 72056437 is about 8488.6063049243. The cubic root of 72056437 is about 416.1254340837.

The spelling of 72056437 in words is "seventy-two million, fifty-six thousand, four hundred thirty-seven".