71605401 has 8 divisors (see below), whose sum is σ = 109113024. Its totient is φ = 40917360.

The previous prime is 71605351. The next prime is 71605421. The reversal of 71605401 is 10450617.

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

It is not a de Polignac number, because 71605401 - 2⁶ = 71605337 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (71605421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1704870 + ... + 1704911.

It is an arithmetic number, because the mean of its divisors is an integer number (13639128).

Almost surely, 2^71605401 is an apocalyptic number.

It is an amenable number.

71605401 is a deficient number, since it is larger than the sum of its proper divisors (37507623).

71605401 is a wasteful number, since it uses less digits than its factorization.

71605401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3409791.

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 71605401 is about 8461.9974592291. The cubic root of 71605401 is about 415.2553728945.

It can be divided in two parts, 7160 and 5401, that added together give a triangular number (12561 = T₁₅₈).

The spelling of 71605401 in words is "seventy-one million, six hundred five thousand, four hundred one".