72739844 has 6 divisors (see below), whose sum is σ = 127294734. Its totient is φ = 36369920.

The previous prime is 72739841. The next prime is 72739853. The reversal of 72739844 is 44893727.

It can be written as a sum of positive squares in only one way, i.e., 53114944 + 19624900 = 7288^2 + 4430^2 .

It is a junction number, because it is equal to n+sod(n) for n = 72739795 and 72739804.

It is not an unprimeable number, because it can be changed into a prime (72739841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9092477 + ... + 9092484.

It is an arithmetic number, because the mean of its divisors is an integer number (21215789).

Almost surely, 2^72739844 is an apocalyptic number.

It is an amenable number.

72739844 is a deficient number, since it is larger than the sum of its proper divisors (54554890).

72739844 is a wasteful number, since it uses less digits than its factorization.

72739844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18184965 (or 18184963 counting only the distinct ones).

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

The square root of 72739844 is about 8528.7656785727. The cubic root of 72739844 is about 417.4368537291.

The spelling of 72739844 in words is "seventy-two million, seven hundred thirty-nine thousand, eight hundred forty-four".