72638783 has 4 divisors (see below), whose sum is σ = 83015760. Its totient is φ = 62261808.

The previous prime is 72638777. The next prime is 72638789. The reversal of 72638783 is 38783627.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 38783627 = 1499 ⋅25873.

It is an interprime number because it is at equal distance from previous prime (72638777) and next prime (72638789).

It is not a de Polignac number, because 72638783 - 2¹² = 72634687 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 (72638789) 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, 5188478 + ... + 5188491.

It is an arithmetic number, because the mean of its divisors is an integer number (20753940).

Almost surely, 2^72638783 is an apocalyptic number.

72638783 is a deficient number, since it is larger than the sum of its proper divisors (10376977).

72638783 is a wasteful number, since it uses less digits than its factorization.

72638783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10376976.

The product of its digits is 338688, while the sum is 44.

The square root of 72638783 is about 8522.8389049659. The cubic root of 72638783 is about 417.2434423609.

The spelling of 72638783 in words is "seventy-two million, six hundred thirty-eight thousand, seven hundred eighty-three".