71640342 has 16 divisors (see below), whose sum is σ = 159200880. Its totient is φ = 23880096.

The previous prime is 71640341. The next prime is 71640347. The reversal of 71640342 is 24304617.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71640341) 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, 663283 + ... + 663390.

It is an arithmetic number, because the mean of its divisors is an integer number (9950055).

Almost surely, 2^71640342 is an apocalyptic number.

71640342 is an abundant number, since it is smaller than the sum of its proper divisors (87560538).

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

71640342 is a wasteful number, since it uses less digits than its factorization.

71640342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1326684 (or 1326678 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 71640342 is about 8464.0617908898. The cubic root of 71640342 is about 415.3229054102.

Adding to 71640342 its reverse (24304617), we get a palindrome (95944959).

The spelling of 71640342 in words is "seventy-one million, six hundred forty thousand, three hundred forty-two".