78791081402 has 24 divisors (see below), whose sum is σ = 130625403636. Its totient is φ = 35616240000.

The previous prime is 78791081387. The next prime is 78791081407. The reversal of 78791081402 is 20418019787.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 66249097321 + 12541984081 = 257389^2 + 111991^2 .

It is not an unprimeable number, because it can be changed into a prime (78791081407) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 855599 + ... + 943202.

Almost surely, 2^78791081402 is an apocalyptic number.

78791081402 is a deficient number, since it is larger than the sum of its proper divisors (51834322234).

78791081402 is a wasteful number, since it uses less digits than its factorization.

78791081402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1799006 (or 1798995 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 47.

The spelling of 78791081402 in words is "seventy-eight billion, seven hundred ninety-one million, eighty-one thousand, four hundred two".