65861604 has 72 divisors (see below), whose sum is σ = 183980160. Its totient is φ = 19759872.

The previous prime is 65861597. The next prime is 65861611. The reversal of 65861604 is 40616856.

It is an interprime number because it is at equal distance from previous prime (65861597) and next prime (65861611).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11737 + ... + 16415.

It is an arithmetic number, because the mean of its divisors is an integer number (2555280).

Almost surely, 2^65861604 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65861604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91990080).

65861604 is an abundant number, since it is smaller than the sum of its proper divisors (118118556).

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

65861604 is a wasteful number, since it uses less digits than its factorization.

65861604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4729 (or 4724 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 65861604 is about 8115.5162497527. The cubic root of 65861604 is about 403.8413339624.

The spelling of 65861604 in words is "sixty-five million, eight hundred sixty-one thousand, six hundred four".