71242605 has 32 divisors (see below), whose sum is σ = 144748800. Its totient is φ = 32567616.

The previous prime is 71242601. The next prime is 71242621. The reversal of 71242605 is 50624217.

71242605 is a `hidden beast` number, since 7 + 12 + 42 + 605 = 666.

It is not a de Polignac number, because 71242605 - 2² = 71242601 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71242601) 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, 36750 + ... + 38639.

It is an arithmetic number, because the mean of its divisors is an integer number (4523400).

Almost surely, 2^71242605 is an apocalyptic number.

It is an amenable number.

71242605 is an abundant number, since it is smaller than the sum of its proper divisors (73506195).

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

71242605 is a wasteful number, since it uses less digits than its factorization.

71242605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75410 (or 75404 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 71242605 is about 8440.5334547053. The cubic root of 71242605 is about 414.5528740252.

The spelling of 71242605 in words is "seventy-one million, two hundred forty-two thousand, six hundred five".