64905481 has 4 divisors (see below), whose sum is σ = 64930000. Its totient is φ = 64880964.

The previous prime is 64905479. The next prime is 64905493. The reversal of 64905481 is 18450946.

It is a happy number.

64905481 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 64905481 - 2¹ = 64905479 is a prime.

It is a super-2 number, since 2×64905481² = 8425442927682722, which contains 22 as substring.

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 64905481.

It is not an unprimeable number, because it can be changed into a prime (64905461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7731 + ... + 13768.

It is an arithmetic number, because the mean of its divisors is an integer number (16232500).

Almost surely, 2^64905481 is an apocalyptic number.

It is an amenable number.

64905481 is a deficient number, since it is larger than the sum of its proper divisors (24519).

64905481 is a wasteful number, since it uses less digits than its factorization.

64905481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24518.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 64905481 is about 8056.3937962341. The cubic root of 64905481 is about 401.8775915847.

The spelling of 64905481 in words is "sixty-four million, nine hundred five thousand, four hundred eighty-one".