77248999891 has 8 divisors (see below), whose sum is σ = 88732717920. Its totient is φ = 65877318528.

The previous prime is 77248999853. The next prime is 77248999907. The reversal of 77248999891 is 19899984277.

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

It is not a de Polignac number, because 77248999891 - 2²¹ = 77246902739 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77248999801) 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, 28007686 + ... + 28010443.

It is an arithmetic number, because the mean of its divisors is an integer number (11091589740).

Almost surely, 2^77248999891 is an apocalyptic number.

77248999891 is a deficient number, since it is larger than the sum of its proper divisors (11483718029).

77248999891 is a wasteful number, since it uses less digits than its factorization.

77248999891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56018333.

The product of its digits is 164602368, while the sum is 73.

The spelling of 77248999891 in words is "seventy-seven billion, two hundred forty-eight million, nine hundred ninety-nine thousand, eight hundred ninety-one".