71631390 has 32 divisors (see below), whose sum is σ = 177463296. Its totient is φ = 18485280.

The previous prime is 71631377. The next prime is 71631401. The reversal of 71631390 is 9313617.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

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, 37582 + ... + 39441.

It is an arithmetic number, because the mean of its divisors is an integer number (5545728).

Almost surely, 2^71631390 is an apocalyptic number.

71631390 is an abundant number, since it is smaller than the sum of its proper divisors (105831906).

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

71631390 is a wasteful number, since it uses less digits than its factorization.

71631390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77064.

The product of its (nonzero) digits is 3402, while the sum is 30.

The square root of 71631390 is about 8463.5329502519. The cubic root of 71631390 is about 415.3056054484.

The spelling of 71631390 in words is "seventy-one million, six hundred thirty-one thousand, three hundred ninety".