78790217238 has 64 divisors (see below), whose sum is σ = 177549004800. Its totient is φ = 25895376000.

The previous prime is 78790217227. The next prime is 78790217293. The reversal of 78790217238 is 83271209787.

It is a super-2 number, since 2×78790217238² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3191470 + ... + 3216062.

It is an arithmetic number, because the mean of its divisors is an integer number (2774203200).

Almost surely, 2^78790217238 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78790217238, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88774502400).

78790217238 is an abundant number, since it is smaller than the sum of its proper divisors (98758787562).

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

78790217238 is a wasteful number, since it uses less digits than its factorization.

78790217238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25434 (or 25428 counting only the distinct ones).

The product of its (nonzero) digits is 2370816, while the sum is 54.

The spelling of 78790217238 in words is "seventy-eight billion, seven hundred ninety million, two hundred seventeen thousand, two hundred thirty-eight".