64420745 has 8 divisors (see below), whose sum is σ = 79970760. Its totient is φ = 49759360.

The previous prime is 64420739. The next prime is 64420753. The reversal of 64420745 is 54702446.

It can be written as a sum of positive squares in 4 ways, for example, as 19114384 + 45306361 = 4372^2 + 6731^2 .

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

It is not a de Polignac number, because 64420745 - 2¹⁶ = 64355209 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 221996 + ... + 222285.

It is an arithmetic number, because the mean of its divisors is an integer number (9996345).

Almost surely, 2^64420745 is an apocalyptic number.

It is an amenable number.

64420745 is a deficient number, since it is larger than the sum of its proper divisors (15550015).

64420745 is a wasteful number, since it uses less digits than its factorization.

64420745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444315.

The product of its (nonzero) digits is 26880, while the sum is 32.

The square root of 64420745 is about 8026.2534846590. The cubic root of 64420745 is about 400.8746382094.

The spelling of 64420745 in words is "sixty-four million, four hundred twenty thousand, seven hundred forty-five".