71924340 has 48 divisors (see below), whose sum is σ = 207889920. Its totient is φ = 18560640.

The previous prime is 71924311. The next prime is 71924341. The reversal of 71924340 is 4342917.

It is a happy number.

It is a super-2 number, since 2×71924340² = 10346221368871200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 71924298 and 71924307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71924341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17475 + ... + 21194.

It is an arithmetic number, because the mean of its divisors is an integer number (4331040).

Almost surely, 2^71924340 is an apocalyptic number.

It is an amenable number.

71924340 is an abundant number, since it is smaller than the sum of its proper divisors (135965580).

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

71924340 is a wasteful number, since it uses less digits than its factorization.

71924340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38712 (or 38710 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 71924340 is about 8480.8218941327. The cubic root of 71924340 is about 415.8709921098.

The spelling of 71924340 in words is "seventy-one million, nine hundred twenty-four thousand, three hundred forty".