72805412 has 6 divisors (see below), whose sum is σ = 127409478. Its totient is φ = 36402704.

The previous prime is 72805409. The next prime is 72805451. The reversal of 72805412 is 21450827.

It can be written as a sum of positive squares in only one way, i.e., 47665216 + 25140196 = 6904^2 + 5014^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9100673 + ... + 9100680.

It is an arithmetic number, because the mean of its divisors is an integer number (21234913).

Almost surely, 2^72805412 is an apocalyptic number.

It is an amenable number.

72805412 is a deficient number, since it is larger than the sum of its proper divisors (54604066).

72805412 is a wasteful number, since it uses less digits than its factorization.

72805412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18201357 (or 18201355 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 72805412 is about 8532.6087452783. The cubic root of 72805412 is about 417.5622425040.

The spelling of 72805412 in words is "seventy-two million, eight hundred five thousand, four hundred twelve".