38787640 has 64 divisors (see below), whose sum is σ = 90992160. Its totient is φ = 14868480.

The previous prime is 38787629. The next prime is 38787641. The reversal of 38787640 is 4678783.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38787641) 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, 109704 + ... + 110056.

Almost surely, 2^38787640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 38787640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45496080).

38787640 is an abundant number, since it is smaller than the sum of its proper divisors (52204520).

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

38787640 is a wasteful number, since it uses less digits than its factorization.

38787640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472 (or 468 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 43.

The square root of 38787640 is about 6227.9723827262. The cubic root of 38787640 is about 338.5045043463.

The spelling of 38787640 in words is "thirty-eight million, seven hundred eighty-seven thousand, six hundred forty".