64990536 has 64 divisors (see below), whose sum is σ = 177643200. Its totient is φ = 19692288.

The previous prime is 64990531. The next prime is 64990543. The reversal of 64990536 is 63509946.

It is not an unprimeable number, because it can be changed into a prime (64990531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19350 + ... + 22458.

It is an arithmetic number, because the mean of its divisors is an integer number (2775675).

Almost surely, 2^64990536 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64990536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88821600).

64990536 is an abundant number, since it is smaller than the sum of its proper divisors (112652664).

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

64990536 is a wasteful number, since it uses less digits than its factorization.

64990536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3198 (or 3194 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 42.

The square root of 64990536 is about 8061.6707945686. The cubic root of 64990536 is about 402.0530609894.

The spelling of 64990536 in words is "sixty-four million, nine hundred ninety thousand, five hundred thirty-six".