64509818 has 16 divisors (see below), whose sum is σ = 98625384. Its totient is φ = 31637760.

The previous prime is 64509799. The next prime is 64509821. The reversal of 64509818 is 81890546.

It can be written as a sum of positive squares in 4 ways, for example, as 34774609 + 29735209 = 5897^2 + 5453^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74846 + ... + 75702.

Almost surely, 2^64509818 is an apocalyptic number.

64509818 is a deficient number, since it is larger than the sum of its proper divisors (34115566).

64509818 is a wasteful number, since it uses less digits than its factorization.

64509818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1537.

The product of its (nonzero) digits is 69120, while the sum is 41.

The square root of 64509818 is about 8031.8004208272. The cubic root of 64509818 is about 401.0593129968.

The spelling of 64509818 in words is "sixty-four million, five hundred nine thousand, eight hundred eighteen".