65239040 has 96 divisors (see below), whose sum is σ = 163931040. Its totient is φ = 24870912.

The previous prime is 65239037. The next prime is 65239043. The reversal of 65239040 is 4093256.

It is an interprime number because it is at equal distance from previous prime (65239037) and next prime (65239043).

It is a super-2 number, since 2×65239040² = 8512264680243200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 65238994 and 65239012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65239043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 235382 + ... + 235658.

It is an arithmetic number, because the mean of its divisors is an integer number (1707615).

Almost surely, 2^65239040 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65239040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81965520).

65239040 is an abundant number, since it is smaller than the sum of its proper divisors (98692000).

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

65239040 is a wasteful number, since it uses less digits than its factorization.

65239040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327 (or 307 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 65239040 is about 8077.0687752427. The cubic root of 65239040 is about 402.5648520170.

The spelling of 65239040 in words is "sixty-five million, two hundred thirty-nine thousand, forty".