63155540 has 48 divisors (see below), whose sum is σ = 153858432. Its totient is φ = 21326976.

The previous prime is 63155531. The next prime is 63155549. The reversal of 63155540 is 4555136.

It is an interprime number because it is at equal distance from previous prime (63155531) and next prime (63155549).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63155549) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6014 + ... + 12746.

It is an arithmetic number, because the mean of its divisors is an integer number (3205384).

Almost surely, 2^63155540 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63155540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76929216).

63155540 is an abundant number, since it is smaller than the sum of its proper divisors (90702892).

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

63155540 is a wasteful number, since it uses less digits than its factorization.

63155540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6816 (or 6814 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 29.

The square root of 63155540 is about 7947.0459920652. The cubic root of 63155540 is about 398.2329133408.

The spelling of 63155540 in words is "sixty-three million, one hundred fifty-five thousand, five hundred forty".