72838081 has 4 divisors (see below), whose sum is σ = 77122692. Its totient is φ = 68553472.

The previous prime is 72838067. The next prime is 72838091. The reversal of 72838081 is 18083827.

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 46991025 + 25847056 = 6855^2 + 5084^2 .

It is a cyclic number.

It is not a de Polignac number, because 72838081 - 2⁵ = 72838049 is a prime.

It is a super-2 number, since 2×72838081² = 10610772087525122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72838081.

It is not an unprimeable number, because it can be changed into a prime (72838091) 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, 2142280 + ... + 2142313.

It is an arithmetic number, because the mean of its divisors is an integer number (19280673).

Almost surely, 2^72838081 is an apocalyptic number.

It is an amenable number.

72838081 is a deficient number, since it is larger than the sum of its proper divisors (4284611).

72838081 is a wasteful number, since it uses less digits than its factorization.

72838081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4284610.

The product of its (nonzero) digits is 21504, while the sum is 37.

The square root of 72838081 is about 8534.5228923473. The cubic root of 72838081 is about 417.6246888738.

It can be divided in two parts, 728 and 38081, that added together give a square (38809 = 197²).

The spelling of 72838081 in words is "seventy-two million, eight hundred thirty-eight thousand, eighty-one".