78161706 has 64 divisors (see below), whose sum is σ = 208972800. Its totient is φ = 21154608.

The previous prime is 78161701. The next prime is 78161711. The reversal of 78161706 is 60716187.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (78161701) and next prime (78161711).

It is a super-2 number, since 2×78161706² = 12218504569660872, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78161701) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1741 + ... + 12623.

It is an arithmetic number, because the mean of its divisors is an integer number (3265200).

Almost surely, 2^78161706 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78161706, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104486400).

78161706 is an abundant number, since it is smaller than the sum of its proper divisors (130811094).

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

78161706 is a wasteful number, since it uses less digits than its factorization.

78161706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10920 (or 10914 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 78161706 is about 8840.9109259171. The cubic root of 78161706 is about 427.5609269888.

The spelling of 78161706 in words is "seventy-eight million, one hundred sixty-one thousand, seven hundred six".