63977770 has 16 divisors (see below), whose sum is σ = 119131560. Its totient is φ = 24708544.

The previous prime is 63977713. The next prime is 63977779. The reversal of 63977770 is 7777936.

It can be written as a sum of positive squares in 4 ways, for example, as 51538041 + 12439729 = 7179^2 + 3527^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 63977770.

It is not an unprimeable number, because it can be changed into a prime (63977779) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110017 + ... + 110596.

Almost surely, 2^63977770 is an apocalyptic number.

63977770 is a deficient number, since it is larger than the sum of its proper divisors (55153790).

63977770 is a wasteful number, since it uses less digits than its factorization.

63977770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220649.

The product of its (nonzero) digits is 388962, while the sum is 46.

The square root of 63977770 is about 7998.6105043314. The cubic root of 63977770 is about 399.9536821368.

The spelling of 63977770 in words is "sixty-three million, nine hundred seventy-seven thousand, seven hundred seventy".