72663506 has 4 divisors (see below), whose sum is σ = 108995262. Its totient is φ = 36331752.

The previous prime is 72663499. The next prime is 72663511. The reversal of 72663506 is 60536627.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60536627 = 2609 ⋅23203.

It can be written as a sum of positive squares in only one way, i.e., 54096025 + 18567481 = 7355^2 + 4309^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18165875 + ... + 18165878.

Almost surely, 2^72663506 is an apocalyptic number.

72663506 is a deficient number, since it is larger than the sum of its proper divisors (36331756).

72663506 is a wasteful number, since it uses less digits than its factorization.

72663506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36331755.

The product of its (nonzero) digits is 45360, while the sum is 35.

The square root of 72663506 is about 8524.2891785767. The cubic root of 72663506 is about 417.2907740071.

The spelling of 72663506 in words is "seventy-two million, six hundred sixty-three thousand, five hundred six".