18764536 has 16 divisors (see below), whose sum is σ = 40209840. Its totient is φ = 8041920.

The previous prime is 18764531. The next prime is 18764539. The reversal of 18764536 is 63546781.

It is a happy number.

It is a super-2 number, since 2×18764536² = 704215622590592, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18764531) 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, 167485 + ... + 167596.

It is an arithmetic number, because the mean of its divisors is an integer number (2513115).

Almost surely, 2^18764536 is an apocalyptic number.

It is an amenable number.

18764536 is an abundant number, since it is smaller than the sum of its proper divisors (21445304).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18764536 is a wasteful number, since it uses less digits than its factorization.

18764536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335094 (or 335090 counting only the distinct ones).

The product of its digits is 120960, while the sum is 40.

The square root of 18764536 is about 4331.8051664404. The cubic root of 18764536 is about 265.7332770288.

The spelling of 18764536 in words is "eighteen million, seven hundred sixty-four thousand, five hundred thirty-six".