65773640 has 16 divisors (see below), whose sum is σ = 147990780. Its totient is φ = 26309440.

The previous prime is 65773639. The next prime is 65773667. The reversal of 65773640 is 4637756.

It can be written as a sum of positive squares in 2 ways, for example, as 63457156 + 2316484 = 7966^2 + 1522^2 .

It is a junction number, because it is equal to n+sod(n) for n = 65773594 and 65773603.

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, 822131 + ... + 822210.

Almost surely, 2^65773640 is an apocalyptic number.

It is an amenable number.

65773640 is an abundant number, since it is smaller than the sum of its proper divisors (82217140).

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

65773640 is a wasteful number, since it uses less digits than its factorization.

65773640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1644352 (or 1644348 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 38.

The square root of 65773640 is about 8110.0949439572. The cubic root of 65773640 is about 403.6614652497.

The spelling of 65773640 in words is "sixty-five million, seven hundred seventy-three thousand, six hundred forty".