65421320 has 32 divisors (see below), whose sum is σ = 147985920. Its totient is φ = 26028480.

The previous prime is 65421311. The next prime is 65421329. The reversal of 65421320 is 2312456.

It is an interprime number because it is at equal distance from previous prime (65421311) and next prime (65421329).

It is a super-2 number, since 2×65421320² = 8559898221084800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65421329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3359 + ... + 11921.

It is an arithmetic number, because the mean of its divisors is an integer number (4624560).

Almost surely, 2^65421320 is an apocalyptic number.

It is an amenable number.

65421320 is an abundant number, since it is smaller than the sum of its proper divisors (82564600).

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

65421320 is a wasteful number, since it uses less digits than its factorization.

65421320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8765 (or 8761 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 65421320 is about 8088.3447008643. The cubic root of 65421320 is about 402.9394298032.

Adding to 65421320 its reverse (2312456), we get a palindrome (67733776).

The spelling of 65421320 in words is "sixty-five million, four hundred twenty-one thousand, three hundred twenty".