72779709 has 16 divisors (see below), whose sum is σ = 102574080. Its totient is φ = 45774000.

The previous prime is 72779687. The next prime is 72779719. The reversal of 72779709 is 90797727.

It is a happy number.

It is not a de Polignac number, because 72779709 - 2⁵ = 72779677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72779719) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11764 + ... + 16850.

It is an arithmetic number, because the mean of its divisors is an integer number (6410880).

Almost surely, 2^72779709 is an apocalyptic number.

It is an amenable number.

72779709 is a deficient number, since it is larger than the sum of its proper divisors (29794371).

72779709 is a wasteful number, since it uses less digits than its factorization.

72779709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5360.

The product of its (nonzero) digits is 388962, while the sum is 48.

The square root of 72779709 is about 8531.1024492735. The cubic root of 72779709 is about 417.5130984213.

The spelling of 72779709 in words is "seventy-two million, seven hundred seventy-nine thousand, seven hundred nine".