71864520 has 128 divisors (see below), whose sum is σ = 265386240. Its totient is φ = 15160320.

The previous prime is 71864519. The next prime is 71864521. The reversal of 71864520 is 2546817.

It is an interprime number because it is at equal distance from previous prime (71864519) and next prime (71864521).

It is not an unprimeable number, because it can be changed into a prime (71864521) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7630 + ... + 14210.

It is an arithmetic number, because the mean of its divisors is an integer number (2073330).

Almost surely, 2^71864520 is an apocalyptic number.

71864520 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71864520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (132693120).

71864520 is an abundant number, since it is smaller than the sum of its proper divisors (193521720).

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

71864520 is a wasteful number, since it uses less digits than its factorization.

71864520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6615 (or 6611 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 71864520 is about 8477.2943796945. The cubic root of 71864520 is about 415.7556658153.

The spelling of 71864520 in words is "seventy-one million, eight hundred sixty-four thousand, five hundred twenty".