71971782 has 16 divisors (see below), whose sum is σ = 144244992. Its totient is φ = 23940360.

The previous prime is 71971763. The next prime is 71971787. The reversal of 71971782 is 28717917.

It is a super-3 number, since 3×71971782³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71971787) 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, 9394 + ... + 15237.

It is an arithmetic number, because the mean of its divisors is an integer number (9015312).

Almost surely, 2^71971782 is an apocalyptic number.

71971782 is an abundant number, since it is smaller than the sum of its proper divisors (72273210).

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

71971782 is a wasteful number, since it uses less digits than its factorization.

71971782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25123.

The product of its digits is 49392, while the sum is 42.

The square root of 71971782 is about 8483.6184496947. The cubic root of 71971782 is about 415.9624095410.

The spelling of 71971782 in words is "seventy-one million, nine hundred seventy-one thousand, seven hundred eighty-two".