64501778 has 16 divisors (see below), whose sum is σ = 106996896. Its totient is φ = 28916640.

The previous prime is 64501769. The next prime is 64501783. The reversal of 64501778 is 87710546.

It is a super-2 number, since 2×64501778² = 8320958730322568, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18476 + ... + 21687.

It is an arithmetic number, because the mean of its divisors is an integer number (6687306).

Almost surely, 2^64501778 is an apocalyptic number.

64501778 is a deficient number, since it is larger than the sum of its proper divisors (42495118).

64501778 is a wasteful number, since it uses less digits than its factorization.

64501778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40249.

The product of its (nonzero) digits is 47040, while the sum is 38.

The square root of 64501778 is about 8031.2998947866. The cubic root of 64501778 is about 401.0426506708.

It can be divided in two parts, 6450 and 1778, that added together give a palindrome (8228).

The spelling of 64501778 in words is "sixty-four million, five hundred one thousand, seven hundred seventy-eight".