78253031380 has 24 divisors (see below), whose sum is σ = 167025325320. Its totient is φ = 30788077440.

The previous prime is 78253031333. The next prime is 78253031383. The reversal of 78253031380 is 8313035287.

It can be written as a sum of positive squares in 4 ways, for example, as 2933522244 + 75319509136 = 54162^2 + 274444^2 .

It is a super-2 number, since 2×78253031380² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78253031383) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32069695 + ... + 32072134.

It is an arithmetic number, because the mean of its divisors is an integer number (6959388555).

Almost surely, 2^78253031380 is an apocalyptic number.

It is an amenable number.

78253031380 is an abundant number, since it is smaller than the sum of its proper divisors (88772293940).

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

78253031380 is a wasteful number, since it uses less digits than its factorization.

78253031380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64141899 (or 64141897 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 40.

The spelling of 78253031380 in words is "seventy-eight billion, two hundred fifty-three million, thirty-one thousand, three hundred eighty".