8187640 has 32 divisors (see below), whose sum is σ = 18604080. Its totient is φ = 3242752.

The previous prime is 8187637. The next prime is 8187661. The reversal of 8187640 is 467818.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 8187596 and 8187605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3324 + ... + 5236.

Almost surely, 2^8187640 is an apocalyptic number.

It is an amenable number.

8187640 is an abundant number, since it is smaller than the sum of its proper divisors (10416440).

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

8187640 is a wasteful number, since it uses less digits than its factorization.

8187640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2031 (or 2027 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 8187640 is about 2861.4052491739. The cubic root of 8187640 is about 201.5515982526.

The spelling of 8187640 in words is "eight million, one hundred eighty-seven thousand, six hundred forty".