64990480 has 20 divisors (see below), whose sum is σ = 151103052. Its totient is φ = 25996160.

The previous prime is 64990459. The next prime is 64990483. The reversal of 64990480 is 8409946.

It can be written as a sum of positive squares in 2 ways, for example, as 17875984 + 47114496 = 4228^2 + 6864^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (64990483) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 406111 + ... + 406270.

Almost surely, 2^64990480 is an apocalyptic number.

It is an amenable number.

64990480 is an abundant number, since it is smaller than the sum of its proper divisors (86112572).

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

64990480 is a wasteful number, since it uses less digits than its factorization.

64990480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812394 (or 812388 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 64990480 is about 8061.6673213424. The cubic root of 64990480 is about 402.0529455112.

The spelling of 64990480 in words is "sixty-four million, nine hundred ninety thousand, four hundred eighty".