78061640 has 32 divisors (see below), whose sum is σ = 177353280. Its totient is φ = 30919872.

The previous prime is 78061631. The next prime is 78061651. The reversal of 78061640 is 4616087.

It is a junction number, because it is equal to n+sod(n) for n = 78061597 and 78061606.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5354 + ... + 13593.

It is an arithmetic number, because the mean of its divisors is an integer number (5542290).

Almost surely, 2^78061640 is an apocalyptic number.

It is an amenable number.

78061640 is an abundant number, since it is smaller than the sum of its proper divisors (99291640).

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

78061640 is a wasteful number, since it uses less digits than its factorization.

78061640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19061 (or 19057 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 78061640 is about 8835.2498549843. The cubic root of 78061640 is about 427.3783883988.

The spelling of 78061640 in words is "seventy-eight million, sixty-one thousand, six hundred forty".