71805642 has 16 divisors (see below), whose sum is σ = 145755552. Its totient is φ = 23577840.

The previous prime is 71805631. The next prime is 71805649. The reversal of 71805642 is 24650817.

It is not an unprimeable number, because it can be changed into a prime (71805649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88909 + ... + 89712.

It is an arithmetic number, because the mean of its divisors is an integer number (9109722).

Almost surely, 2^71805642 is an apocalyptic number.

71805642 is an abundant number, since it is smaller than the sum of its proper divisors (73949910).

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

71805642 is a wasteful number, since it uses less digits than its factorization.

71805642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178693.

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 71805642 is about 8473.8209799358. The cubic root of 71805642 is about 415.6420930803.

The spelling of 71805642 in words is "seventy-one million, eight hundred five thousand, six hundred forty-two".