63440155 has 8 divisors (see below), whose sum is σ = 76470912. Its totient is φ = 50523648.

The previous prime is 63440147. The next prime is 63440159. The reversal of 63440155 is 55104436.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 63440155 - 2³ = 63440147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63440159) by changing a digit.

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, 27334 + ... + 29563.

It is an arithmetic number, because the mean of its divisors is an integer number (9558864).

Almost surely, 2^63440155 is an apocalyptic number.

63440155 is a deficient number, since it is larger than the sum of its proper divisors (13030757).

63440155 is a wasteful number, since it uses less digits than its factorization.

63440155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57125.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 63440155 is about 7964.9328308530. The cubic root of 63440155 is about 398.8302387311.

The spelling of 63440155 in words is "sixty-three million, four hundred forty thousand, one hundred fifty-five".