667777536 has 60 divisors (see below), whose sum is σ = 1927264482. Its totient is φ = 222590976.

The previous prime is 667777529. The next prime is 667777547. The reversal of 667777536 is 635777766.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 456249600 + 211527936 = 21360^2 + 14544^2 .

It is a super-3 number, since 3×667777536³ (a number of 27 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67851 + ... + 77066.

Almost surely, 2^667777536 is an apocalyptic number.

It is an amenable number.

667777536 is an abundant number, since it is smaller than the sum of its proper divisors (1259486946).

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

667777536 is a wasteful number, since it uses less digits than its factorization.

667777536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144941 (or 144922 counting only the distinct ones).

The product of its digits is 7779240, while the sum is 54.

The square root of 667777536 is about 25841.3919129756. The cubic root of 667777536 is about 874.0654123535.

The spelling of 667777536 in words is "six hundred sixty-seven million, seven hundred seventy-seven thousand, five hundred thirty-six".