64405851 has 8 divisors (see below), whose sum is σ = 86282304. Its totient is φ = 42733320.

The previous prime is 64405771. The next prime is 64405853. The reversal of 64405851 is 15850446.

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

It is not a de Polignac number, because 64405851 - 2¹³ = 64397659 is a prime.

It is a super-2 number, since 2×64405851² = 8296227286068402, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64405853) 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, 50241 + ... + 51506.

It is an arithmetic number, because the mean of its divisors is an integer number (10785288).

Almost surely, 2^64405851 is an apocalyptic number.

64405851 is a deficient number, since it is larger than the sum of its proper divisors (21876453).

64405851 is a wasteful number, since it uses less digits than its factorization.

64405851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101961.

The product of its (nonzero) digits is 19200, while the sum is 33.

The square root of 64405851 is about 8025.3256008713. The cubic root of 64405851 is about 400.8437419142.

It can be divided in two parts, 64405 and 851, that added together give a palindrome (65256).

The spelling of 64405851 in words is "sixty-four million, four hundred five thousand, eight hundred fifty-one".