66402620 has 24 divisors (see below), whose sum is σ = 143945088. Its totient is φ = 25704000.

The previous prime is 66402607. The next prime is 66402643. The reversal of 66402620 is 2620466.

It is a self number, because there is not a number n which added to its sum of digits gives 66402620.

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, 52931 + ... + 54170.

It is an arithmetic number, because the mean of its divisors is an integer number (5997712).

Almost surely, 2^66402620 is an apocalyptic number.

It is an amenable number.

66402620 is an abundant number, since it is smaller than the sum of its proper divisors (77542468).

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

66402620 is a wasteful number, since it uses less digits than its factorization.

66402620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107141 (or 107139 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 66402620 is about 8148.7802768267. The cubic root of 66402620 is about 404.9440963329.

The spelling of 66402620 in words is "sixty-six million, four hundred two thousand, six hundred twenty".