78297237838 has 4 divisors (see below), whose sum is σ = 117445856760. Its totient is φ = 39148618918.

The previous prime is 78297237827. The next prime is 78297237839. The reversal of 78297237838 is 83873279287.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×78297237838² (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 78297237838.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78297237839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19574309458 + ... + 19574309461.

It is an arithmetic number, because the mean of its divisors is an integer number (29361464190).

Almost surely, 2^78297237838 is an apocalyptic number.

78297237838 is a deficient number, since it is larger than the sum of its proper divisors (39148618922).

78297237838 is a wasteful number, since it uses less digits than its factorization.

78297237838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39148618921.

The product of its digits is 56899584, while the sum is 64.

The spelling of 78297237838 in words is "seventy-eight billion, two hundred ninety-seven million, two hundred thirty-seven thousand, eight hundred thirty-eight".