64998090 has 48 divisors (see below), whose sum is σ = 169510536. Its totient is φ = 17280000.

The previous prime is 64998053. The next prime is 64998091. The reversal of 64998090 is 9089946.

It can be written as a sum of positive squares in 4 ways, for example, as 58201641 + 6796449 = 7629^2 + 2607^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (64998091) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 35190 + ... + 36990.

Almost surely, 2^64998090 is an apocalyptic number.

64998090 is an abundant number, since it is smaller than the sum of its proper divisors (104512446).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64998090 is a wasteful number, since it uses less digits than its factorization.

64998090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2215 (or 2212 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 64998090 is about 8062.1392942568. The cubic root of 64998090 is about 402.0686375710.

The spelling of 64998090 in words is "sixty-four million, nine hundred ninety-eight thousand, ninety".