71139552 has 192 divisors, whose sum is σ = 222082560. Its totient is φ = 19712000.

The previous prime is 71139539. The next prime is 71139589. The reversal of 71139552 is 25593117.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 704302 + ... + 704402.

It is an arithmetic number, because the mean of its divisors is an integer number (1156680).

Almost surely, 2^71139552 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71139552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111041280).

71139552 is an abundant number, since it is smaller than the sum of its proper divisors (150943008).

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

71139552 is a wasteful number, since it uses less digits than its factorization.

71139552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177 (or 169 counting only the distinct ones).

The product of its digits is 9450, while the sum is 33.

The square root of 71139552 is about 8434.4265958037. The cubic root of 71139552 is about 414.3528928827.

The spelling of 71139552 in words is "seventy-one million, one hundred thirty-nine thousand, five hundred fifty-two".