71807946 has 16 divisors (see below), whose sum is σ = 164132544. Its totient is φ = 20516544.

The previous prime is 71807941. The next prime is 71807969. The reversal of 71807946 is 64970817.

It is a super-2 number, since 2×71807946² = 10312762217477832, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 1709713 = 71807946 / (7 + 1 + 8 + 0 + 7 + 9 + 4 + 6).

It is a nialpdrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 71807898 and 71807907.

It is not an unprimeable number, because it can be changed into a prime (71807941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 854815 + ... + 854898.

It is an arithmetic number, because the mean of its divisors is an integer number (10258284).

Almost surely, 2^71807946 is an apocalyptic number.

71807946 is an abundant number, since it is smaller than the sum of its proper divisors (92324598).

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

71807946 is a wasteful number, since it uses less digits than its factorization.

71807946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1709725.

The product of its (nonzero) digits is 84672, while the sum is 42.

The square root of 71807946 is about 8473.9569269616. The cubic root of 71807946 is about 415.6465385488.

The spelling of 71807946 in words is "seventy-one million, eight hundred seven thousand, nine hundred forty-six".