71963864 has 16 divisors (see below), whose sum is σ = 154208400. Its totient is φ = 30841632.

The previous prime is 71963863. The next prime is 71963891. The reversal of 71963864 is 46836917.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71963863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 642479 + ... + 642590.

It is an arithmetic number, because the mean of its divisors is an integer number (9638025).

Almost surely, 2^71963864 is an apocalyptic number.

It is an amenable number.

71963864 is an abundant number, since it is smaller than the sum of its proper divisors (82244536).

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

71963864 is a wasteful number, since it uses less digits than its factorization.

71963864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1285082 (or 1285078 counting only the distinct ones).

The product of its digits is 217728, while the sum is 44.

The square root of 71963864 is about 8483.1517727788. The cubic root of 71963864 is about 415.9471548997.

It can be divided in two parts, 71963 and 864, that added together give a palindrome (72827).

The spelling of 71963864 in words is "seventy-one million, nine hundred sixty-three thousand, eight hundred sixty-four".