78371189436 has 48 divisors (see below), whose sum is σ = 192751529600. Its totient is φ = 24715253952.

The previous prime is 78371189431. The next prime is 78371189503. The reversal of 78371189436 is 63498117387.

It is a happy number.

It is a super-2 number, since 2×78371189436² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78371189431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64075 + ... + 401058.

Almost surely, 2^78371189436 is an apocalyptic number.

78371189436 is a gapful number since it is divisible by the number (76) formed by its first and last digit.

It is an amenable number.

78371189436 is an abundant number, since it is smaller than the sum of its proper divisors (114380340164).

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

78371189436 is a wasteful number, since it uses less digits than its factorization.

78371189436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465898 (or 465896 counting only the distinct ones).

The product of its digits is 6096384, while the sum is 57.

The spelling of 78371189436 in words is "seventy-eight billion, three hundred seventy-one million, one hundred eighty-nine thousand, four hundred thirty-six".