77681963 has 8 divisors (see below), whose sum is σ = 79001088. Its totient is φ = 76374144.

The previous prime is 77681953. The next prime is 77681969. The reversal of 77681963 is 36918677.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77681963 - 2⁸ = 77681707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77681969) 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, 11645 + ... + 17057.

It is an arithmetic number, because the mean of its divisors is an integer number (9875136).

Almost surely, 2^77681963 is an apocalyptic number.

77681963 is a deficient number, since it is larger than the sum of its proper divisors (1319125).

77681963 is a wasteful number, since it uses less digits than its factorization.

77681963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5653.

The product of its digits is 381024, while the sum is 47.

The square root of 77681963 is about 8813.7371755686. The cubic root of 77681963 is about 426.6843661956.

The spelling of 77681963 in words is "seventy-seven million, six hundred eighty-one thousand, nine hundred sixty-three".