78372947826 has 12 divisors (see below), whose sum is σ = 169808053662. Its totient is φ = 26124315936.

The previous prime is 78372947819. The next prime is 78372947827. The reversal of 78372947826 is 62874927387.

78372947826 is a `hidden beast` number, since 78 + 3 + 72 + 9 + 478 + 26 = 666.

It can be written as a sum of positive squares in only one way, i.e., 65354366025 + 13018581801 = 255645^2 + 114099^2 .

It is a super-2 number, since 2×78372947826² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78372947827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2177026311 + ... + 2177026346.

Almost surely, 2^78372947826 is an apocalyptic number.

78372947826 is an abundant number, since it is smaller than the sum of its proper divisors (91435105836).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78372947826 is a wasteful number, since it uses less digits than its factorization.

78372947826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4354052665 (or 4354052662 counting only the distinct ones).

The product of its digits is 56899584, while the sum is 63.

The spelling of 78372947826 in words is "seventy-eight billion, three hundred seventy-two million, nine hundred forty-seven thousand, eight hundred twenty-six".