63739440 has 160 divisors (see below), whose sum is σ = 229271040. Its totient is φ = 16245504.

The previous prime is 63739427. The next prime is 63739447. The reversal of 63739440 is 4493736.

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 = 63739395 and 63739404.

It is not an unprimeable number, because it can be changed into a prime (63739447) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 49039 + ... + 50321.

It is an arithmetic number, because the mean of its divisors is an integer number (1432944).

Almost surely, 2^63739440 is an apocalyptic number.

63739440 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 63739440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114635520).

63739440 is an abundant number, since it is smaller than the sum of its proper divisors (165531600).

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

63739440 is a wasteful number, since it uses less digits than its factorization.

63739440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1328 (or 1316 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 36.

The square root of 63739440 is about 7983.6983910967. The cubic root of 63739440 is about 399.4564283259.

The spelling of 63739440 in words is "sixty-three million, seven hundred thirty-nine thousand, four hundred forty".