77421936489 has 8 divisors (see below), whose sum is σ = 103236528192. Its totient is φ = 51610984560.

The previous prime is 77421936481. The next prime is 77421936491. The reversal of 77421936489 is 98463912477.

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

It is not a de Polignac number, because 77421936489 - 2³ = 77421936481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77421936481) 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, 859917 + ... + 945674.

It is an arithmetic number, because the mean of its divisors is an integer number (12904566024).

Almost surely, 2^77421936489 is an apocalyptic number.

It is an amenable number.

77421936489 is a deficient number, since it is larger than the sum of its proper divisors (25814591703).

77421936489 is a wasteful number, since it uses less digits than its factorization.

77421936489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1819887.

The product of its digits is 18289152, while the sum is 60.

The spelling of 77421936489 in words is "seventy-seven billion, four hundred twenty-one million, nine hundred thirty-six thousand, four hundred eighty-nine".