78297232821 has 8 divisors (see below), whose sum is σ = 105569303040. Its totient is φ = 51611658912.

The previous prime is 78297232789. The next prime is 78297232831. The reversal of 78297232821 is 12823279287.

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

It is not a de Polignac number, because 78297232821 - 2⁵ = 78297232789 is a prime.

It is a super-2 number, since 2×78297232821² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78297232831) 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, 146623765 + ... + 146624298.

It is an arithmetic number, because the mean of its divisors is an integer number (13196162880).

Almost surely, 2^78297232821 is an apocalyptic number.

It is an amenable number.

78297232821 is a deficient number, since it is larger than the sum of its proper divisors (27272070219).

78297232821 is a wasteful number, since it uses less digits than its factorization.

78297232821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293248155.

The product of its digits is 1354752, while the sum is 51.

The spelling of 78297232821 in words is "seventy-eight billion, two hundred ninety-seven million, two hundred thirty-two thousand, eight hundred twenty-one".