63928440 has 96 divisors (see below), whose sum is σ = 215495280. Its totient is φ = 17044992.

The previous prime is 63928379. The next prime is 63928453. The reversal of 63928440 is 4482936.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 63928395 and 63928404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6432 + ... + 13008.

Almost surely, 2^63928440 is an apocalyptic number.

63928440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63928440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107747640).

63928440 is an abundant number, since it is smaller than the sum of its proper divisors (151566840).

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

63928440 is a wasteful number, since it uses less digits than its factorization.

63928440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6603 (or 6587 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 63928440 is about 7995.5262490971. The cubic root of 63928440 is about 399.8508610675.

The spelling of 63928440 in words is "sixty-three million, nine hundred twenty-eight thousand, four hundred forty".