72929947 has 4 divisors (see below), whose sum is σ = 74481696. Its totient is φ = 71378200.

The previous prime is 72929929. The next prime is 72929951. The reversal of 72929947 is 74992927.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74992927 = 29 ⋅2585963.

It is a cyclic number.

It is not a de Polignac number, because 72929947 - 2¹⁵ = 72897179 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72929947.

It is not an unprimeable number, because it can be changed into a prime (72929917) 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 3 ways as a sum of consecutive naturals, for example, 775804 + ... + 775897.

It is an arithmetic number, because the mean of its divisors is an integer number (18620424).

Almost surely, 2^72929947 is an apocalyptic number.

72929947 is a deficient number, since it is larger than the sum of its proper divisors (1551749).

72929947 is a wasteful number, since it uses less digits than its factorization.

72929947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1551748.

The product of its digits is 571536, while the sum is 49.

The square root of 72929947 is about 8539.9032195921. The cubic root of 72929947 is about 417.8001895237.

The spelling of 72929947 in words is "seventy-two million, nine hundred twenty-nine thousand, nine hundred forty-seven".