78347940 has 48 divisors (see below), whose sum is σ = 239319360. Its totient is φ = 18993280.

The previous prime is 78347923. The next prime is 78347953. The reversal of 78347940 is 4974387.

It is a super-2 number, since 2×78347940² = 12276799404487200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78347892 and 78347901.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58695 + ... + 60014.

It is an arithmetic number, because the mean of its divisors is an integer number (4985820).

Almost surely, 2^78347940 is an apocalyptic number.

It is an amenable number.

78347940 is an abundant number, since it is smaller than the sum of its proper divisors (160971420).

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

78347940 is a wasteful number, since it uses less digits than its factorization.

78347940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118732 (or 118730 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 42.

The square root of 78347940 is about 8851.4371714428. The cubic root of 78347940 is about 427.9002373240.

The spelling of 78347940 in words is "seventy-eight million, three hundred forty-seven thousand, nine hundred forty".