77946566 has 4 divisors (see below), whose sum is σ = 116919852. Its totient is φ = 38973282.

The previous prime is 77946559. The next prime is 77946571. The reversal of 77946566 is 66564977.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19486640 + ... + 19486643.

It is an arithmetic number, because the mean of its divisors is an integer number (29229963).

Almost surely, 2^77946566 is an apocalyptic number.

77946566 is a deficient number, since it is larger than the sum of its proper divisors (38973286).

77946566 is a wasteful number, since it uses less digits than its factorization.

77946566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38973285.

The product of its digits is 1905120, while the sum is 50.

The square root of 77946566 is about 8828.7352435103. The cubic root of 77946566 is about 427.1682795384.

The spelling of 77946566 in words is "seventy-seven million, nine hundred forty-six thousand, five hundred sixty-six".