72867566 has 4 divisors (see below), whose sum is σ = 109301352. Its totient is φ = 36433782.

The previous prime is 72867533. The next prime is 72867583. The reversal of 72867566 is 66576827.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66576827 = 401 ⋅166027.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 72867566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18216890 + ... + 18216893.

It is an arithmetic number, because the mean of its divisors is an integer number (27325338).

Almost surely, 2^72867566 is an apocalyptic number.

72867566 is a deficient number, since it is larger than the sum of its proper divisors (36433786).

72867566 is a wasteful number, since it uses less digits than its factorization.

72867566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36433785.

The product of its digits is 846720, while the sum is 47.

The square root of 72867566 is about 8536.2501134866. The cubic root of 72867566 is about 417.6810330399.

The spelling of 72867566 in words is "seventy-two million, eight hundred sixty-seven thousand, five hundred sixty-six".