77940067 has 4 divisors (see below), whose sum is σ = 77958216. Its totient is φ = 77921920.

The previous prime is 77940043. The next prime is 77940073. The reversal of 77940067 is 76004977.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77940067 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77940097) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1392 + ... + 12562.

It is an arithmetic number, because the mean of its divisors is an integer number (19489554).

Almost surely, 2^77940067 is an apocalyptic number.

77940067 is a deficient number, since it is larger than the sum of its proper divisors (18149).

77940067 is a wasteful number, since it uses less digits than its factorization.

77940067 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18148.

The product of its (nonzero) digits is 74088, while the sum is 40.

The square root of 77940067 is about 8828.3671763243. The cubic root of 77940067 is about 427.1564071154.

The spelling of 77940067 in words is "seventy-seven million, nine hundred forty thousand, sixty-seven".