65471904 has 72 divisors (see below), whose sum is σ = 186967872. Its totient is φ = 21732480.

The previous prime is 65471881. The next prime is 65471911. The reversal of 65471904 is 40917456.

It is a tau number, because it is divible by the number of its divisors (72).

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

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 133099 + ... + 133589.

It is an arithmetic number, because the mean of its divisors is an integer number (2596776).

Almost surely, 2^65471904 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 65471904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93483936).

65471904 is an abundant number, since it is smaller than the sum of its proper divisors (121495968).

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

65471904 is a wasteful number, since it uses less digits than its factorization.

65471904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 970 (or 959 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 65471904 is about 8091.4710652637. The cubic root of 65471904 is about 403.0432544542.

It can be divided in two parts, 65 and 471904, that added together give a square (471969 = 687²).

The spelling of 65471904 in words is "sixty-five million, four hundred seventy-one thousand, nine hundred four".