65342640 has 160 divisors (see below), whose sum is σ = 225628416. Its totient is φ = 15508480.

The previous prime is 65342633. The next prime is 65342647. The reversal of 65342640 is 4624356.

It is an interprime number because it is at equal distance from previous prime (65342633) and next prime (65342647).

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

It is a junction number, because it is equal to n+sod(n) for n = 65342598 and 65342607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65342647) 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, 139687 + ... + 140153.

Almost surely, 2^65342640 is an apocalyptic number.

65342640 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 65342640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112814208).

65342640 is an abundant number, since it is smaller than the sum of its proper divisors (160285776).

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

65342640 is a wasteful number, since it uses less digits than its factorization.

65342640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547 (or 541 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 30.

The square root of 65342640 is about 8083.4794488512. The cubic root of 65342640 is about 402.7778311463. Note that the first 3 decimals are identical.

Adding to 65342640 its reverse (4624356), we get a palindrome (69966996).

The spelling of 65342640 in words is "sixty-five million, three hundred forty-two thousand, six hundred forty".