65911620 has 48 divisors (see below), whose sum is σ = 186641280. Its totient is φ = 17377536.

The previous prime is 65911613. The next prime is 65911631. The reversal of 65911620 is 2611956.

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

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, 832 + ... + 11511.

It is an arithmetic number, because the mean of its divisors is an integer number (3888360).

Almost surely, 2^65911620 is an apocalyptic number.

65911620 is a gapful number since it is divisible by the number (60) 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 65911620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93320640).

65911620 is an abundant number, since it is smaller than the sum of its proper divisors (120729660).

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

65911620 is a wasteful number, since it uses less digits than its factorization.

65911620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12444 (or 12442 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 65911620 is about 8118.5971694622. The cubic root of 65911620 is about 403.9435352253.

The spelling of 65911620 in words is "sixty-five million, nine hundred eleven thousand, six hundred twenty".