18764690 has 32 divisors (see below), whose sum is σ = 39187584. Its totient is φ = 6336000.

The previous prime is 18764687. The next prime is 18764693. The reversal of 18764690 is 9646781.

It is an interprime number because it is at equal distance from previous prime (18764687) and next prime (18764693).

It is a super-2 number, since 2×18764690² = 704227181592200, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18764693) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2690 + ... + 6690.

It is an arithmetic number, because the mean of its divisors is an integer number (1224612).

Almost surely, 2^18764690 is an apocalyptic number.

18764690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18764690 is an abundant number, since it is smaller than the sum of its proper divisors (20422894).

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

18764690 is a wasteful number, since it uses less digits than its factorization.

18764690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4082.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 18764690 is about 4331.8229419033. The cubic root of 18764690 is about 265.7340039819.

The spelling of 18764690 in words is "eighteen million, seven hundred sixty-four thousand, six hundred ninety".