63809394 has 32 divisors (see below), whose sum is σ = 140256576. Its totient is φ = 19192320.

The previous prime is 63809371. The next prime is 63809401. The reversal of 63809394 is 49390836.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5514 + ... + 12570.

It is an arithmetic number, because the mean of its divisors is an integer number (4383018).

Almost surely, 2^63809394 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63809394, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70128288).

63809394 is an abundant number, since it is smaller than the sum of its proper divisors (76447182).

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

63809394 is a wasteful number, since it uses less digits than its factorization.

63809394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7210.

The product of its (nonzero) digits is 139968, while the sum is 42.

The square root of 63809394 is about 7988.0782419804. The cubic root of 63809394 is about 399.6025093004.

The spelling of 63809394 in words is "sixty-three million, eight hundred nine thousand, three hundred ninety-four".