65220506 has 8 divisors (see below), whose sum is σ = 105356244. Its totient is φ = 30101760.

The previous prime is 65220499. The next prime is 65220509. The reversal of 65220506 is 60502256.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 50282281 + 14938225 = 7091^2 + 3865^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (26), and also a Moran number because the ratio is a prime number: 2508481 = 65220506 / (6 + 5 + 2 + 2 + 0 + 5 + 0 + 6).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (65220509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1254215 + ... + 1254266.

Almost surely, 2^65220506 is an apocalyptic number.

65220506 is a deficient number, since it is larger than the sum of its proper divisors (40135738).

65220506 is a wasteful number, since it uses less digits than its factorization.

65220506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2508496.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 65220506 is about 8075.9213715836. The cubic root of 65220506 is about 402.5267263608.

The spelling of 65220506 in words is "sixty-five million, two hundred twenty thousand, five hundred six".