78206766 has 64 divisors (see below), whose sum is σ = 184985856. Its totient is φ = 21772800.

The previous prime is 78206759. The next prime is 78206827. The reversal of 78206766 is 66760287.

It is a super-2 number, since 2×78206766² = 12232596496357512, which contains 22 as substring.

It is a plaindrome in base 12.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 47436 + ... + 49056.

It is an arithmetic number, because the mean of its divisors is an integer number (2890404).

Almost surely, 2^78206766 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78206766, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92492928).

78206766 is an abundant number, since it is smaller than the sum of its proper divisors (106779090).

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

78206766 is a wasteful number, since it uses less digits than its factorization.

78206766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1697.

The product of its (nonzero) digits is 169344, while the sum is 42.

The square root of 78206766 is about 8843.4589386733. The cubic root of 78206766 is about 427.6430737557.

The spelling of 78206766 in words is "seventy-eight million, two hundred six thousand, seven hundred sixty-six".