78820261252831 has 32 divisors (see below), whose sum is σ = 91164310272000. Its totient is φ = 66752607414240.

The previous prime is 78820261252729. The next prime is 78820261252861. The reversal of 78820261252831 is 13825216202887.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 78820261252831 - 2⁷ = 78820261252703 is a prime.

It is a super-2 number, since 2×78820261252831² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78820261252861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 181104120 + ... + 181538818.

It is an arithmetic number, because the mean of its divisors is an integer number (2848884696000).

Almost surely, 2^{78820261252831} is an apocalyptic number.

78820261252831 is a deficient number, since it is larger than the sum of its proper divisors (12344049019169).

78820261252831 is a wasteful number, since it uses less digits than its factorization.

78820261252831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435739.

The product of its (nonzero) digits is 5160960, while the sum is 55.

The spelling of 78820261252831 in words is "seventy-eight trillion, eight hundred twenty billion, two hundred sixty-one million, two hundred fifty-two thousand, eight hundred thirty-one".