77969681 has 8 divisors (see below), whose sum is σ = 80790528. Its totient is φ = 75168000.

The previous prime is 77969669. The next prime is 77969699. The reversal of 77969681 is 18696977.

It is a happy number.

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 77969681 - 2¹⁸ = 77707537 is a prime.

It is a super-2 number, since 2×77969681² = 12158542310483522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77969611) 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, 3761 + ... + 13041.

It is an arithmetic number, because the mean of its divisors is an integer number (10098816).

Almost surely, 2^77969681 is an apocalyptic number.

It is an amenable number.

77969681 is a deficient number, since it is larger than the sum of its proper divisors (2820847).

77969681 is a wasteful number, since it uses less digits than its factorization.

77969681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9583.

The product of its digits is 1143072, while the sum is 53.

The square root of 77969681 is about 8830.0442241248. The cubic root of 77969681 is about 427.2105008506.

The spelling of 77969681 in words is "seventy-seven million, nine hundred sixty-nine thousand, six hundred eighty-one".