71404440 has 32 divisors (see below), whose sum is σ = 214213680. Its totient is φ = 19041152.

The previous prime is 71404429. The next prime is 71404469. The reversal of 71404440 is 4440417.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 71404440.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 297399 + ... + 297638.

Almost surely, 2^71404440 is an apocalyptic number.

It is an amenable number.

71404440 is an abundant number, since it is smaller than the sum of its proper divisors (142809240).

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

71404440 is a wasteful number, since it uses less digits than its factorization.

71404440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 595051 (or 595047 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 24.

The square root of 71404440 is about 8450.1147921197. The cubic root of 71404440 is about 414.8665366543.

Adding to 71404440 its reverse (4440417), we get a palindrome (75844857).

The spelling of 71404440 in words is "seventy-one million, four hundred four thousand, four hundred forty".