72779946 has 8 divisors (see below), whose sum is σ = 145559904. Its totient is φ = 24259980.

The previous prime is 72779921. The next prime is 72779947. The reversal of 72779946 is 64997727.

It is a happy number.

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

72779946 is an admirable number.

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (72779947) 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 3 ways as a sum of consecutive naturals, for example, 6064990 + ... + 6065001.

It is an arithmetic number, because the mean of its divisors is an integer number (18194988).

Almost surely, 2^72779946 is an apocalyptic number.

72779946 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72779946 is a wasteful number, since it uses less digits than its factorization.

72779946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12129996.

The product of its digits is 1333584, while the sum is 51.

The square root of 72779946 is about 8531.1163396123. The cubic root of 72779946 is about 417.5135516177.

The spelling of 72779946 in words is "seventy-two million, seven hundred seventy-nine thousand, nine hundred forty-six".