71671440 has 40 divisors (see below), whose sum is σ = 222182208. Its totient is φ = 19112320.

The previous prime is 71671429. The next prime is 71671451. The reversal of 71671440 is 4417617.

It is an interprime number because it is at equal distance from previous prime (71671429) and next prime (71671451).

It is a tau number, because it is divible by the number of its divisors (40).

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 = 71671398 and 71671407.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 149076 + ... + 149555.

Almost surely, 2^71671440 is an apocalyptic number.

It is an amenable number.

71671440 is an abundant number, since it is smaller than the sum of its proper divisors (150510768).

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

71671440 is a wasteful number, since it uses less digits than its factorization.

71671440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298647 (or 298641 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 71671440 is about 8465.8986528307. The cubic root of 71671440 is about 415.3829918687.

The spelling of 71671440 in words is "seventy-one million, six hundred seventy-one thousand, four hundred forty".