71645970 has 64 divisors (see below), whose sum is σ = 188697600. Its totient is φ = 17265600.

The previous prime is 71645963. The next prime is 71645971. The reversal of 71645970 is 7954617.

It is not an unprimeable number, because it can be changed into a prime (71645971) 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 31 ways as a sum of consecutive naturals, for example, 65125 + ... + 66215.

It is an arithmetic number, because the mean of its divisors is an integer number (2948400).

Almost surely, 2^71645970 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71645970, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94348800).

71645970 is an abundant number, since it is smaller than the sum of its proper divisors (117051630).

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

71645970 is a wasteful number, since it uses less digits than its factorization.

71645970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1311.

The product of its (nonzero) digits is 52920, while the sum is 39.

The square root of 71645970 is about 8464.3942488521. The cubic root of 71645970 is about 415.3337809217. Note that the first 3 decimals are identical.

The spelling of 71645970 in words is "seventy-one million, six hundred forty-five thousand, nine hundred seventy".