6438780 has 36 divisors (see below), whose sum is σ = 19531512. Its totient is φ = 1716960.

The previous prime is 6438749. The next prime is 6438799. The reversal of 6438780 is 878346.

6438780 is a `hidden beast` number, since 643 + 8 + 7 + 8 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17706 + ... + 18065.

It is an arithmetic number, because the mean of its divisors is an integer number (542542).

Almost surely, 2^6438780 is an apocalyptic number.

6438780 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6438780 is an abundant number, since it is smaller than the sum of its proper divisors (13092732).

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

6438780 is a wasteful number, since it uses less digits than its factorization.

6438780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35786 (or 35781 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 6438780 is about 2537.4751230308. The cubic root of 6438780 is about 186.0378001565.

The spelling of 6438780 in words is "six million, four hundred thirty-eight thousand, seven hundred eighty".