65428739 has 4 divisors (see below), whose sum is σ = 65447520. Its totient is φ = 65409960.

The previous prime is 65428703. The next prime is 65428771. The reversal of 65428739 is 93782456.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 65428739 - 2¹⁶ = 65363203 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 65428739.

It is not an unprimeable number, because it can be changed into a prime (65428789) 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, 2459 + ... + 11700.

It is an arithmetic number, because the mean of its divisors is an integer number (16361880).

Almost surely, 2^65428739 is an apocalyptic number.

65428739 is a deficient number, since it is larger than the sum of its proper divisors (18781).

65428739 is a wasteful number, since it uses less digits than its factorization.

65428739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18780.

The product of its digits is 362880, while the sum is 44.

The square root of 65428739 is about 8088.8033107500. The cubic root of 65428739 is about 402.9546607943.

The spelling of 65428739 in words is "sixty-five million, four hundred twenty-eight thousand, seven hundred thirty-nine".