65421570 has 16 divisors (see below), whose sum is σ = 157011840. Its totient is φ = 17445744.

The previous prime is 65421529. The next prime is 65421571. The reversal of 65421570 is 7512456.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 2180719 = 65421570 / (6 + 5 + 4 + 2 + 1 + 5 + 7 + 0).

It is not an unprimeable number, because it can be changed into a prime (65421571) 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, 1090330 + ... + 1090389.

It is an arithmetic number, because the mean of its divisors is an integer number (9813240).

Almost surely, 2^65421570 is an apocalyptic number.

65421570 is an abundant number, since it is smaller than the sum of its proper divisors (91590270).

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

65421570 is a wasteful number, since it uses less digits than its factorization.

65421570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2180729.

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 65421570 is about 8088.3601551860. The cubic root of 65421570 is about 402.9399430646.

The spelling of 65421570 in words is "sixty-five million, four hundred twenty-one thousand, five hundred seventy".