65628354640 has 40 divisors (see below), whose sum is σ = 152600599008. Its totient is φ = 26248817280.

The previous prime is 65628354593. The next prime is 65628354643. The reversal of 65628354640 is 4645382656.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65628354643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 952555 + ... + 1019125.

Almost surely, 2^65628354640 is an apocalyptic number.

It is an amenable number.

65628354640 is an abundant number, since it is smaller than the sum of its proper divisors (86972244368).

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

65628354640 is a wasteful number, since it uses less digits than its factorization.

65628354640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78907 (or 78901 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 49.

The spelling of 65628354640 in words is "sixty-five billion, six hundred twenty-eight million, three hundred fifty-four thousand, six hundred forty".