71780806 has 8 divisors (see below), whose sum is σ = 107709264. Its totient is φ = 35877720.

The previous prime is 71780773. The next prime is 71780809. The reversal of 71780806 is 60808717.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×71780806² = 10304968220019272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71780809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4311 + ... + 12733.

It is an arithmetic number, because the mean of its divisors is an integer number (13463658).

Almost surely, 2^71780806 is an apocalyptic number.

71780806 is a deficient number, since it is larger than the sum of its proper divisors (35928458).

71780806 is a wasteful number, since it uses less digits than its factorization.

71780806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12686.

The product of its (nonzero) digits is 18816, while the sum is 37.

The square root of 71780806 is about 8472.3553985890. The cubic root of 71780806 is about 415.5941670534.

The spelling of 71780806 in words is "seventy-one million, seven hundred eighty thousand, eight hundred six".