63928890 has 24 divisors (see below), whose sum is σ = 166215348. Its totient is φ = 17047680.

The previous prime is 63928889. The next prime is 63928927. The reversal of 63928890 is 9882936.

63928890 is a `hidden beast` number, since 639 + 2 + 8 + 8 + 9 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 60699681 + 3229209 = 7791^2 + 1797^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 355071 + ... + 355250.

Almost surely, 2^63928890 is an apocalyptic number.

63928890 is an abundant number, since it is smaller than the sum of its proper divisors (102286458).

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

63928890 is a wasteful number, since it uses less digits than its factorization.

63928890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 710334 (or 710331 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 63928890 is about 7995.5543897844. The cubic root of 63928890 is about 399.8517992648.

The spelling of 63928890 in words is "sixty-three million, nine hundred twenty-eight thousand, eight hundred ninety".