67778984 has 32 divisors (see below), whose sum is σ = 156414720. Its totient is φ = 26813376.

The previous prime is 67778981. The next prime is 67778987. The reversal of 67778984 is 48987776.

67778984 = 356² + 357² + ... + 628².

It is an interprime number because it is at equal distance from previous prime (67778981) and next prime (67778987).

It is a Harshad number since it is a multiple of its sum of digits (56).

It is not an unprimeable number, because it can be changed into a prime (67778981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45824 + ... + 47279.

It is an arithmetic number, because the mean of its divisors is an integer number (4887960).

Almost surely, 2^67778984 is an apocalyptic number.

It is an amenable number.

67778984 is an abundant number, since it is smaller than the sum of its proper divisors (88635736).

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

67778984 is a wasteful number, since it uses less digits than its factorization.

67778984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93129 (or 93125 counting only the distinct ones).

The product of its digits is 4741632, while the sum is 56.

The square root of 67778984 is about 8232.7992809250. The cubic root of 67778984 is about 407.7228189121.

The spelling of 67778984 in words is "sixty-seven million, seven hundred seventy-eight thousand, nine hundred eighty-four".