72779 has 8 divisors (see below), whose sum is σ = 85728. Its totient is φ = 60480.

The previous prime is 72767. The next prime is 72797. The reversal of 72779 is 97727.

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

It is not a de Polignac number, because 72779 - 2⁴ = 72763 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72719) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 119 + ... + 399.

It is an arithmetic number, because the mean of its divisors is an integer number (10716).

2⁷²⁷⁷⁹ is an apocalyptic number.

72779 is a deficient number, since it is larger than the sum of its proper divisors (12949).

72779 is a wasteful number, since it uses less digits than its factorization.

72779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325.

The product of its digits is 6174, while the sum is 32.

The square root of 72779 is about 269.7758328687. The cubic root of 72779 is about 41.7511742651.

The spelling of 72779 in words is "seventy-two thousand, seven hundred seventy-nine".