71439004 has 72 divisors (see below), whose sum is σ = 160032768. Its totient is φ = 27293760.

The previous prime is 71438987. The next prime is 71439023. The reversal of 71439004 is 40093417.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 146449 + ... + 146935.

Almost surely, 2^71439004 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 71439004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80016384).

71439004 is an abundant number, since it is smaller than the sum of its proper divisors (88593764).

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

71439004 is a wasteful number, since it uses less digits than its factorization.

71439004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 555 (or 540 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 71439004 is about 8452.1597239995. The cubic root of 71439004 is about 414.9334658904.

The spelling of 71439004 in words is "seventy-one million, four hundred thirty-nine thousand, four".