72820538 has 8 divisors (see below), whose sum is σ = 124835232. Its totient is φ = 31208796.

The previous prime is 72820529. The next prime is 72820547. The reversal of 72820538 is 83502827.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (72820529) and next prime (72820547).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 72820498 and 72820507.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2600720 + ... + 2600747.

It is an arithmetic number, because the mean of its divisors is an integer number (15604404).

Almost surely, 2^72820538 is an apocalyptic number.

72820538 is a deficient number, since it is larger than the sum of its proper divisors (52014694).

72820538 is a wasteful number, since it uses less digits than its factorization.

72820538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5201476.

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 72820538 is about 8533.4950635715. The cubic root of 72820538 is about 417.5911579786.

The spelling of 72820538 in words is "seventy-two million, eight hundred twenty thousand, five hundred thirty-eight".