77922641 has 4 divisors (see below), whose sum is σ = 78861552. Its totient is φ = 76983732.

The previous prime is 77922631. The next prime is 77922659. The reversal of 77922641 is 14622977.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 14622977 = 409 ⋅35753.

It is a cyclic number.

It is not a de Polignac number, because 77922641 - 2¹⁰ = 77921617 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77922595 and 77922604.

It is not an unprimeable number, because it can be changed into a prime (77922601) 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, 469331 + ... + 469496.

It is an arithmetic number, because the mean of its divisors is an integer number (19715388).

Almost surely, 2^77922641 is an apocalyptic number.

It is an amenable number.

77922641 is a deficient number, since it is larger than the sum of its proper divisors (938911).

77922641 is an equidigital number, since it uses as much as digits as its factorization.

77922641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 938910.

The product of its digits is 42336, while the sum is 38.

The square root of 77922641 is about 8827.3801889349. The cubic root of 77922641 is about 427.1245699074.

The spelling of 77922641 in words is "seventy-seven million, nine hundred twenty-two thousand, six hundred forty-one".