78456890 has 48 divisors (see below), whose sum is σ = 154271520. Its totient is φ = 28647360.

The previous prime is 78456883. The next prime is 78456923. The reversal of 78456890 is 9865487.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 159545 + ... + 160035.

It is an arithmetic number, because the mean of its divisors is an integer number (3213990).

Almost surely, 2^78456890 is an apocalyptic number.

78456890 is a deficient number, since it is larger than the sum of its proper divisors (75814630).

78456890 is a wasteful number, since it uses less digits than its factorization.

78456890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575 (or 546 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 47.

The square root of 78456890 is about 8857.5894011859. The cubic root of 78456890 is about 428.0984903045.

The spelling of 78456890 in words is "seventy-eight million, four hundred fifty-six thousand, eight hundred ninety".