18640528600 has 48 divisors (see below), whose sum is σ = 43348230000. Its totient is φ = 7454663040.

The previous prime is 18640528597. The next prime is 18640528603. The reversal of 18640528600 is 682504681.

It is an interprime number because it is at equal distance from previous prime (18640528597) and next prime (18640528603).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18640528603) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1794622 + ... + 1804978.

It is an arithmetic number, because the mean of its divisors is an integer number (903088125).

Almost surely, 2^18640528600 is an apocalyptic number.

18640528600 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18640528600 is an abundant number, since it is smaller than the sum of its proper divisors (24707701400).

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

18640528600 is a wasteful number, since it uses less digits than its factorization.

18640528600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19372 (or 19363 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 40.

The spelling of 18640528600 in words is "eighteen billion, six hundred forty million, five hundred twenty-eight thousand, six hundred".