65231540 has 24 divisors (see below), whose sum is σ = 149440032. Its totient is φ = 23720480.

The previous prime is 65231513. The next prime is 65231563. The reversal of 65231540 is 4513256.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 148034 + ... + 148473.

It is an arithmetic number, because the mean of its divisors is an integer number (6226668).

Almost surely, 2^65231540 is an apocalyptic number.

It is an amenable number.

65231540 is an abundant number, since it is smaller than the sum of its proper divisors (84208492).

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

65231540 is a wasteful number, since it uses less digits than its factorization.

65231540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296527 (or 296525 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 65231540 is about 8076.6044845591. The cubic root of 65231540 is about 402.5494248939.

Adding to 65231540 its reverse (4513256), we get a palindrome (69744796).

The spelling of 65231540 in words is "sixty-five million, two hundred thirty-one thousand, five hundred forty".