78843540 has 192 divisors, whose sum is σ = 252887040. Its totient is φ = 18247680.

The previous prime is 78843511. The next prime is 78843599. The reversal of 78843540 is 4534887.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 812772 + ... + 812868.

It is an arithmetic number, because the mean of its divisors is an integer number (1317120).

Almost surely, 2^78843540 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78843540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126443520).

78843540 is an abundant number, since it is smaller than the sum of its proper divisors (174043500).

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

78843540 is a wasteful number, since it uses less digits than its factorization.

78843540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182 (or 180 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 39.

The square root of 78843540 is about 8879.3884924583. The cubic root of 78843540 is about 428.8005876045.

The spelling of 78843540 in words is "seventy-eight million, eight hundred forty-three thousand, five hundred forty".