71951620 has 96 divisors (see below), whose sum is σ = 171601920. Its totient is φ = 25159680.

The previous prime is 71951611. The next prime is 71951629. The reversal of 71951620 is 2615917.

It is an interprime number because it is at equal distance from previous prime (71951611) and next prime (71951629).

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (71951629) 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, 636684 + ... + 636796.

It is an arithmetic number, because the mean of its divisors is an integer number (1787520).

Almost surely, 2^71951620 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71951620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85800960).

71951620 is an abundant number, since it is smaller than the sum of its proper divisors (99650300).

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

71951620 is a wasteful number, since it uses less digits than its factorization.

71951620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245 (or 243 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 31.

The square root of 71951620 is about 8482.4300763402. The cubic root of 71951620 is about 415.9235636807.

The spelling of 71951620 in words is "seventy-one million, nine hundred fifty-one thousand, six hundred twenty".