78319446 has 16 divisors (see below), whose sum is σ = 156814704. Its totient is φ = 26077184.

The previous prime is 78319433. The next prime is 78319487. The reversal of 78319446 is 64491387.

It is a super-2 number, since 2×78319446² = 12267871243493832, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78319398 and 78319407.

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, 1131 + ... + 12566.

It is an arithmetic number, because the mean of its divisors is an integer number (9800919).

Almost surely, 2^78319446 is an apocalyptic number.

78319446 is an abundant number, since it is smaller than the sum of its proper divisors (78495258).

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

78319446 is a wasteful number, since it uses less digits than its factorization.

78319446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14655.

The product of its digits is 145152, while the sum is 42.

The square root of 78319446 is about 8849.8274559451. The cubic root of 78319446 is about 427.8483573479.

The spelling of 78319446 in words is "seventy-eight million, three hundred nineteen thousand, four hundred forty-six".