71523420 has 48 divisors (see below), whose sum is σ = 212048928. Its totient is φ = 17950720.

The previous prime is 71523349. The next prime is 71523433. The reversal of 71523420 is 2432517.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34041 + ... + 36080.

It is an arithmetic number, because the mean of its divisors is an integer number (4417686).

Almost surely, 2^71523420 is an apocalyptic number.

It is an amenable number.

71523420 is an abundant number, since it is smaller than the sum of its proper divisors (140525508).

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

71523420 is a wasteful number, since it uses less digits than its factorization.

71523420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70150 (or 70148 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 71523420 is about 8457.1520028908. The cubic root of 71523420 is about 415.0968371301.

Adding to 71523420 its reverse (2432517), we get a palindrome (73955937).

The spelling of 71523420 in words is "seventy-one million, five hundred twenty-three thousand, four hundred twenty".