67428864 has 60 divisors (see below), whose sum is σ = 194617566. Its totient is φ = 22474752.

The previous prime is 67428863. The next prime is 67428877. The reversal of 67428864 is 46882476.

It can be written as a sum of positive squares in only one way, i.e., 67371264 + 57600 = 8208^2 + 240^2 .

It is not an unprimeable number, because it can be changed into a prime (67428863) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2709 + ... + 11924.

Almost surely, 2^67428864 is an apocalyptic number.

67428864 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

67428864 is an abundant number, since it is smaller than the sum of its proper divisors (127188702).

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

67428864 is a wasteful number, since it uses less digits than its factorization.

67428864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14657 (or 14638 counting only the distinct ones).

The product of its digits is 516096, while the sum is 45.

The square root of 67428864 is about 8211.5080222819. The cubic root of 67428864 is about 407.0195605021.

The spelling of 67428864 in words is "sixty-seven million, four hundred twenty-eight thousand, eight hundred sixty-four".