67977564 has 12 divisors (see below), whose sum is σ = 158614344. Its totient is φ = 22659184.

The previous prime is 67977541. The next prime is 67977583. The reversal of 67977564 is 46577976.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is a plaindrome in base 13.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2832387 + ... + 2832410.

It is an arithmetic number, because the mean of its divisors is an integer number (13217862).

Almost surely, 2^67977564 is an apocalyptic number.

It is an amenable number.

67977564 is an abundant number, since it is smaller than the sum of its proper divisors (90636780).

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

67977564 is a wasteful number, since it uses less digits than its factorization.

67977564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5664804 (or 5664802 counting only the distinct ones).

The product of its digits is 2222640, while the sum is 51.

The square root of 67977564 is about 8244.8507566844. The cubic root of 67977564 is about 408.1206150509.

The spelling of 67977564 in words is "sixty-seven million, nine hundred seventy-seven thousand, five hundred sixty-four".