78323135972 has 6 divisors (see below), whose sum is σ = 137065487958. Its totient is φ = 39161567984.

The previous prime is 78323135971. The next prime is 78323135977. The reversal of 78323135972 is 27953132387.

It can be written as a sum of positive squares in only one way, i.e., 78101245156 + 221890816 = 279466^2 + 14896^2 .

It is a super-2 number, since 2×78323135972² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78323135972.

It is not an unprimeable number, because it can be changed into a prime (78323135971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9790391993 + ... + 9790392000.

It is an arithmetic number, because the mean of its divisors is an integer number (22844247993).

Almost surely, 2^78323135972 is an apocalyptic number.

It is an amenable number.

78323135972 is a deficient number, since it is larger than the sum of its proper divisors (58742351986).

78323135972 is a wasteful number, since it uses less digits than its factorization.

78323135972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19580783997 (or 19580783995 counting only the distinct ones).

The product of its digits is 1905120, while the sum is 50.

The spelling of 78323135972 in words is "seventy-eight billion, three hundred twenty-three million, one hundred thirty-five thousand, nine hundred seventy-two".