65172660 has 96 divisors (see below), whose sum is σ = 219555840. Its totient is φ = 14110848.

The previous prime is 65172659. The next prime is 65172661. The reversal of 65172660 is 6627156.

It is an interprime number because it is at equal distance from previous prime (65172659) and next prime (65172661).

It is a super-2 number, since 2×65172660² = 8494951222951200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65172661) 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, 3897 + ... + 12063.

It is an arithmetic number, because the mean of its divisors is an integer number (2287040).

Almost surely, 2^65172660 is an apocalyptic number.

65172660 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 65172660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109777920).

65172660 is an abundant number, since it is smaller than the sum of its proper divisors (154383180).

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

65172660 is a wasteful number, since it uses less digits than its factorization.

65172660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8205 (or 8203 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 65172660 is about 8072.9585654827. The cubic root of 65172660 is about 402.4282705917.

The spelling of 65172660 in words is "sixty-five million, one hundred seventy-two thousand, six hundred sixty".