78173406 has 12 divisors (see below), whose sum is σ = 169375752. Its totient is φ = 26057796.

The previous prime is 78173399. The next prime is 78173443. The reversal of 78173406 is 60437187.

It is a super-2 number, since 2×78173406² = 12222162811281672, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2171466 + ... + 2171501.

It is an arithmetic number, because the mean of its divisors is an integer number (14114646).

Almost surely, 2^78173406 is an apocalyptic number.

78173406 is an abundant number, since it is smaller than the sum of its proper divisors (91202346).

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

78173406 is a wasteful number, since it uses less digits than its factorization.

78173406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4342975 (or 4342972 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The square root of 78173406 is about 8841.5725976774. The cubic root of 78173406 is about 427.5822597425.

The spelling of 78173406 in words is "seventy-eight million, one hundred seventy-three thousand, four hundred six".