78353806 has 4 divisors (see below), whose sum is σ = 117530712. Its totient is φ = 39176902.

The previous prime is 78353791. The next prime is 78353809. The reversal of 78353806 is 60835387.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60835387 = 641 ⋅94907.

It is a super-2 number, since 2×78353806² = 12278637829371272, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78353809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19588450 + ... + 19588453.

It is an arithmetic number, because the mean of its divisors is an integer number (29382678).

Almost surely, 2^78353806 is an apocalyptic number.

78353806 is a deficient number, since it is larger than the sum of its proper divisors (39176906).

78353806 is a wasteful number, since it uses less digits than its factorization.

78353806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39176905.

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 78353806 is about 8851.7685238601. The cubic root of 78353806 is about 427.9109161844.

The spelling of 78353806 in words is "seventy-eight million, three hundred fifty-three thousand, eight hundred six".