77947940869 has 8 divisors (see below), whose sum is σ = 79689985920. Its totient is φ = 76209378336.

The previous prime is 77947940771. The next prime is 77947940887. The reversal of 77947940869 is 96804974977.

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 77947940869 - 2³¹ = 75800457221 is a prime.

It is a super-2 number, since 2×77947940869² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77947940798 and 77947940807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77947940969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 825339 + ... + 914920.

It is an arithmetic number, because the mean of its divisors is an integer number (9961248240).

Almost surely, 2^77947940869 is an apocalyptic number.

It is an amenable number.

77947940869 is a deficient number, since it is larger than the sum of its proper divisors (1742045051).

77947940869 is a wasteful number, since it uses less digits than its factorization.

77947940869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1741259.

The product of its (nonzero) digits is 192036096, while the sum is 70.

The spelling of 77947940869 in words is "seventy-seven billion, nine hundred forty-seven million, nine hundred forty thousand, eight hundred sixty-nine".