72787718 has 4 divisors (see below), whose sum is σ = 109181580. Its totient is φ = 36393858.

The previous prime is 72787717. The next prime is 72787787. The reversal of 72787718 is 81778727.

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: 81778727 = 349 ⋅234323.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72787717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18196928 + ... + 18196931.

It is an arithmetic number, because the mean of its divisors is an integer number (27295395).

Almost surely, 2^72787718 is an apocalyptic number.

72787718 is a deficient number, since it is larger than the sum of its proper divisors (36393862).

72787718 is a wasteful number, since it uses less digits than its factorization.

72787718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36393861.

The product of its digits is 307328, while the sum is 47.

The square root of 72787718 is about 8531.5718364203. The cubic root of 72787718 is about 417.5284128535.

The spelling of 72787718 in words is "seventy-two million, seven hundred eighty-seven thousand, seven hundred eighteen".