78346646 has 16 divisors (see below), whose sum is σ = 135336960. Its totient is φ = 33320040.

The previous prime is 78346589. The next prime is 78346669. The reversal of 78346646 is 64664387.

It is a happy number.

It is a super-2 number, since 2×78346646² = 12276393878898632, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78346597 and 78346606.

It is a congruent number.

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, 19526 + ... + 23193.

It is an arithmetic number, because the mean of its divisors is an integer number (8458560).

Almost surely, 2^78346646 is an apocalyptic number.

78346646 is a deficient number, since it is larger than the sum of its proper divisors (56990314).

78346646 is a wasteful number, since it uses less digits than its factorization.

78346646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42859.

The product of its digits is 580608, while the sum is 44.

The square root of 78346646 is about 8851.3640756665. The cubic root of 78346646 is about 427.8978815677.

The spelling of 78346646 in words is "seventy-eight million, three hundred forty-six thousand, six hundred forty-six".