65172240 has 240 divisors, whose sum is σ = 255186048. Its totient is φ = 14598144.

The previous prime is 65172229. The next prime is 65172241. The reversal of 65172240 is 4227156.

65172240 = T₂₇₅ + T₂₇₆ + ... + T₇₄₃.

65172240 is a `hidden beast` number, since 651 + 7 + 2 + 2 + 4 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

It is not an unprimeable number, because it can be changed into a prime (65172241) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 337584 + ... + 337776.

Almost surely, 2^65172240 is an apocalyptic number.

65172240 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 65172240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (127593024).

65172240 is an abundant number, since it is smaller than the sum of its proper divisors (190013808).

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

65172240 is a wasteful number, since it uses less digits than its factorization.

65172240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286 (or 277 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 65172240 is about 8072.9325526725. The cubic root of 65172240 is about 402.4274061176.

Adding to 65172240 its reverse (4227156), we get a palindrome (69399396).

The spelling of 65172240 in words is "sixty-five million, one hundred seventy-two thousand, two hundred forty".