64988777 has 16 divisors (see below), whose sum is σ = 78274560. Its totient is φ = 52751952.

The previous prime is 64988771. The next prime is 64988801. The reversal of 64988777 is 77788946.

It is a cyclic number.

It is not a de Polignac number, because 64988777 - 2⁶ = 64988713 is a prime.

It is a super-2 number, since 2×64988777² = 8447082271911458, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64988771) 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 15 ways as a sum of consecutive naturals, for example, 14624 + ... + 18542.

It is an arithmetic number, because the mean of its divisors is an integer number (4892160).

Almost surely, 2^64988777 is an apocalyptic number.

It is an amenable number.

64988777 is a deficient number, since it is larger than the sum of its proper divisors (13285783).

64988777 is a wasteful number, since it uses less digits than its factorization.

64988777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4052.

The product of its digits is 4741632, while the sum is 56.

The square root of 64988777 is about 8061.5616973388. The cubic root of 64988777 is about 402.0494337038.

The spelling of 64988777 in words is "sixty-four million, nine hundred eighty-eight thousand, seven hundred seventy-seven".