72291979 has 8 divisors (see below), whose sum is σ = 77953680. Its totient is φ = 66816000.

The previous prime is 72291971. The next prime is 72291997. The reversal of 72291979 is 97919227.

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

It is a cyclic number.

It is not a de Polignac number, because 72291979 - 2³ = 72291971 is a prime.

It is a super-2 number, since 2×72291979² = 10452260455472882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72291971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45622 + ... + 47179.

It is an arithmetic number, because the mean of its divisors is an integer number (9744210).

Almost surely, 2^72291979 is an apocalyptic number.

72291979 is a deficient number, since it is larger than the sum of its proper divisors (5661701).

72291979 is a wasteful number, since it uses less digits than its factorization.

72291979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92861.

The product of its digits is 142884, while the sum is 46.

The square root of 72291979 is about 8502.4689943569. The cubic root of 72291979 is about 416.5783587432.

The spelling of 72291979 in words is "seventy-two million, two hundred ninety-one thousand, nine hundred seventy-nine".