72819779 has 8 divisors (see below), whose sum is σ = 74519040. Its totient is φ = 71126856.

The previous prime is 72819707. The next prime is 72819793. The reversal of 72819779 is 97791827.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72819779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72819079) 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 in 7 ways as a sum of consecutive naturals, for example, 27842 + ... + 30344.

It is an arithmetic number, because the mean of its divisors is an integer number (9314880).

Almost surely, 2^72819779 is an apocalyptic number.

72819779 is a deficient number, since it is larger than the sum of its proper divisors (1699261).

72819779 is a wasteful number, since it uses less digits than its factorization.

72819779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3169.

The product of its digits is 444528, while the sum is 50.

The square root of 72819779 is about 8533.4505916423. The cubic root of 72819779 is about 417.5897071389.

The spelling of 72819779 in words is "seventy-two million, eight hundred nineteen thousand, seven hundred seventy-nine".