67878784 has 16 divisors (see below), whose sum is σ = 135227520. Its totient is φ = 33939328.

The previous prime is 67878781. The next prime is 67878791. The reversal of 67878784 is 48787876.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67878781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265024 + ... + 265279.

It is an arithmetic number, because the mean of its divisors is an integer number (8451720).

Almost surely, 2^67878784 is an apocalyptic number.

67878784 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

67878784 is a deficient number, since it is larger than the sum of its proper divisors (67348736).

67878784 is an equidigital number, since it uses as much as digits as its factorization.

67878784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530317 (or 530305 counting only the distinct ones).

The product of its digits is 4214784, while the sum is 55.

The square root of 67878784 is about 8238.8581733150. The cubic root of 67878784 is about 407.9228355928.

The spelling of 67878784 in words is "sixty-seven million, eight hundred seventy-eight thousand, seven hundred eighty-four".