78905890292 has 6 divisors (see below), whose sum is σ = 138085308018. Its totient is φ = 39452945144.

The previous prime is 78905890249. The next prime is 78905890313. The reversal of 78905890292 is 29209850987.

It can be written as a sum of positive squares in only one way, i.e., 48415841296 + 30490048996 = 220036^2 + 174614^2 .

It is a super-2 number, since 2×78905890292² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 9863236283 + ... + 9863236290.

It is an arithmetic number, because the mean of its divisors is an integer number (23014218003).

Almost surely, 2^78905890292 is an apocalyptic number.

It is an amenable number.

78905890292 is a deficient number, since it is larger than the sum of its proper divisors (59179417726).

78905890292 is a wasteful number, since it uses less digits than its factorization.

78905890292 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19726472577 (or 19726472575 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 59.

The spelling of 78905890292 in words is "seventy-eight billion, nine hundred five million, eight hundred ninety thousand, two hundred ninety-two".