65633780 has 12 divisors (see below), whose sum is σ = 137830980. Its totient is φ = 26253504.

The previous prime is 65633779. The next prime is 65633797. The reversal of 65633780 is 8733656.

It can be written as a sum of positive squares in 2 ways, for example, as 38987536 + 26646244 = 6244^2 + 5162^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1640825 + ... + 1640864.

It is an arithmetic number, because the mean of its divisors is an integer number (11485915).

Almost surely, 2^65633780 is an apocalyptic number.

It is an amenable number.

65633780 is an abundant number, since it is smaller than the sum of its proper divisors (72197200).

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

65633780 is a wasteful number, since it uses less digits than its factorization.

65633780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3281698 (or 3281696 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 38.

The square root of 65633780 is about 8101.4677682504. The cubic root of 65633780 is about 403.3751491529.

The spelling of 65633780 in words is "sixty-five million, six hundred thirty-three thousand, seven hundred eighty".