65215580 has 24 divisors (see below), whose sum is σ = 142908192. Its totient is φ = 24951872.

The previous prime is 65215547. The next prime is 65215597. The reversal of 65215580 is 8551256.

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, 70427 + ... + 71346.

It is an arithmetic number, because the mean of its divisors is an integer number (5954508).

Almost surely, 2^65215580 is an apocalyptic number.

It is an amenable number.

65215580 is an abundant number, since it is smaller than the sum of its proper divisors (77692612).

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

65215580 is a wasteful number, since it uses less digits than its factorization.

65215580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141805 (or 141803 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 32.

The square root of 65215580 is about 8075.6163851436. The cubic root of 65215580 is about 402.5165920401.

The spelling of 65215580 in words is "sixty-five million, two hundred fifteen thousand, five hundred eighty".