72784814 has 4 divisors (see below), whose sum is σ = 109177224. Its totient is φ = 36392406.

The previous prime is 72784813. The next prime is 72784897. The reversal of 72784814 is 41848727.

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: 41848727 = 823 ⋅50849.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72784813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18196202 + ... + 18196205.

It is an arithmetic number, because the mean of its divisors is an integer number (27294306).

Almost surely, 2^72784814 is an apocalyptic number.

72784814 is a deficient number, since it is larger than the sum of its proper divisors (36392410).

72784814 is a wasteful number, since it uses less digits than its factorization.

72784814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36392409.

The product of its digits is 100352, while the sum is 41.

The square root of 72784814 is about 8531.4016433409. The cubic root of 72784814 is about 417.5228600915.

The spelling of 72784814 in words is "seventy-two million, seven hundred eighty-four thousand, eight hundred fourteen".