65120100 has 72 divisors (see below), whose sum is σ = 189967008. Its totient is φ = 17222400.

The previous prime is 65120089. The next prime is 65120117. The reversal of 65120100 is 102156.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 65120100.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38472 + ... + 40128.

Almost surely, 2^65120100 is an apocalyptic number.

65120100 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 65120100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94983504).

65120100 is an abundant number, since it is smaller than the sum of its proper divisors (124846908).

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

65120100 is a wasteful number, since it uses less digits than its factorization.

65120100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1805 (or 1798 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 65120100 is about 8069.7025967504. The cubic root of 65120100 is about 402.3200589657.

Adding to 65120100 its reverse (102156), we get a palindrome (65222256).

The spelling of 65120100 in words is "sixty-five million, one hundred twenty thousand, one hundred".