65521672 has 64 divisors (see below), whose sum is σ = 138510000. Its totient is φ = 28901376.

The previous prime is 65521669. The next prime is 65521691. The reversal of 65521672 is 27612556.

It can be written as a sum of positive squares in 8 ways, for example, as 58155876 + 7365796 = 7626^2 + 2714^2 .

It is a Harshad number since it is a multiple of its sum of digits (34).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 145704 + ... + 146152.

Almost surely, 2^65521672 is an apocalyptic number.

It is an amenable number.

65521672 is an abundant number, since it is smaller than the sum of its proper divisors (72988328).

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

65521672 is a wasteful number, since it uses less digits than its factorization.

65521672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538 (or 534 counting only the distinct ones).

The product of its digits is 25200, while the sum is 34.

The square root of 65521672 is about 8094.5458180185. The cubic root of 65521672 is about 403.1453520723.

The spelling of 65521672 in words is "sixty-five million, five hundred twenty-one thousand, six hundred seventy-two".