64511990 has 16 divisors (see below), whose sum is σ = 117250848. Its totient is φ = 25553856.

The previous prime is 64511963. The next prime is 64512001. The reversal of 64511990 is 9911546.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 64511990.

It is a congruent number.

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, 30287 + ... + 32346.

It is an arithmetic number, because the mean of its divisors is an integer number (7328178).

Almost surely, 2^64511990 is an apocalyptic number.

64511990 is a deficient number, since it is larger than the sum of its proper divisors (52738858).

64511990 is a wasteful number, since it uses less digits than its factorization.

64511990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62743.

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 64511990 is about 8031.9356322122. The cubic root of 64511990 is about 401.0638140742.

The spelling of 64511990 in words is "sixty-four million, five hundred eleven thousand, nine hundred ninety".