65621789 has 8 divisors (see below), whose sum is σ = 66336768. Its totient is φ = 64910160.

The previous prime is 65621779. The next prime is 65621813. The reversal of 65621789 is 98712656.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 65621789 - 2⁸ = 65621533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65621779) 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, 61319 + ... + 62379.

It is an arithmetic number, because the mean of its divisors is an integer number (8292096).

Almost surely, 2^65621789 is an apocalyptic number.

It is an amenable number.

65621789 is a deficient number, since it is larger than the sum of its proper divisors (714979).

65621789 is a wasteful number, since it uses less digits than its factorization.

65621789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1675.

The product of its digits is 181440, while the sum is 44.

The square root of 65621789 is about 8100.7276833628. The cubic root of 65621789 is about 403.3505827076.

The spelling of 65621789 in words is "sixty-five million, six hundred twenty-one thousand, seven hundred eighty-nine".