71620440 has 64 divisors (see below), whose sum is σ = 220116960. Its totient is φ = 18631680.

The previous prime is 71620429. The next prime is 71620441. The reversal of 71620440 is 4402617.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 71620440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71620441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2359 + ... + 12198.

Almost surely, 2^71620440 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 71620440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110058480).

71620440 is an abundant number, since it is smaller than the sum of its proper divisors (148496520).

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

71620440 is a wasteful number, since it uses less digits than its factorization.

71620440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14612 (or 14608 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 71620440 is about 8462.8860325541. The cubic root of 71620440 is about 415.2844423423.

The spelling of 71620440 in words is "seventy-one million, six hundred twenty thousand, four hundred forty".