65220730 has 16 divisors (see below), whose sum is σ = 123576480. Its totient is φ = 24715152.

The previous prime is 65220707. The next prime is 65220761. The reversal of 65220730 is 3702256.

65220730 = 210² + 211² + ... + 589².

It is a junction number, because it is equal to n+sod(n) for n = 65220695 and 65220704.

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, 171444 + ... + 171823.

It is an arithmetic number, because the mean of its divisors is an integer number (7723530).

Almost surely, 2^65220730 is an apocalyptic number.

65220730 is a deficient number, since it is larger than the sum of its proper divisors (58355750).

65220730 is a wasteful number, since it uses less digits than its factorization.

65220730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343293.

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 65220730 is about 8075.9352399583. The cubic root of 65220730 is about 402.5271871866.

Adding to 65220730 its reverse (3702256), we get a palindrome (68922986).

The spelling of 65220730 in words is "sixty-five million, two hundred twenty thousand, seven hundred thirty".