72824387 has 4 divisors (see below), whose sum is σ = 73114776. Its totient is φ = 72534000.

The previous prime is 72824357. The next prime is 72824461. The reversal of 72824387 is 78342827.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72824387 - 2¹² = 72820291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72824347) 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, 144818 + ... + 145319.

It is an arithmetic number, because the mean of its divisors is an integer number (18278694).

Almost surely, 2^72824387 is an apocalyptic number.

72824387 is a deficient number, since it is larger than the sum of its proper divisors (290389).

72824387 is a wasteful number, since it uses less digits than its factorization.

72824387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290388.

The product of its digits is 150528, while the sum is 41.

The square root of 72824387 is about 8533.7205836610. The cubic root of 72824387 is about 417.5985152439.

Subtracting from 72824387 its sum of digits (41), we obtain a triangular number (72824346 = T₁₂₀₆₈).

The spelling of 72824387 in words is "seventy-two million, eight hundred twenty-four thousand, three hundred eighty-seven".