65604540 has 24 divisors (see below), whose sum is σ = 183692880. Its totient is φ = 17494528.

The previous prime is 65604509. The next prime is 65604557. The reversal of 65604540 is 4540656.

It is a super-2 number, since 2×65604540² = 8607911337223200, which contains 22 as substring.

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 = 65604498 and 65604507.

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, 546645 + ... + 546764.

It is an arithmetic number, because the mean of its divisors is an integer number (7653870).

Almost surely, 2^65604540 is an apocalyptic number.

65604540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

65604540 is an abundant number, since it is smaller than the sum of its proper divisors (118088340).

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

65604540 is a wasteful number, since it uses less digits than its factorization.

65604540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1093421 (or 1093419 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 65604540 is about 8099.6629559507. The cubic root of 65604540 is about 403.3152387362.

It can be divided in two parts, 656045 and 40, that added together give a triangular number (656085 = T₁₁₄₅).

The spelling of 65604540 in words is "sixty-five million, six hundred four thousand, five hundred forty".