49681664 has 18 divisors (see below), whose sum is σ = 99169770. Its totient is φ = 24840704.

The previous prime is 49681663. The next prime is 49681691. The reversal of 49681664 is 46618694.

It can be written as a sum of positive squares in only one way, i.e., 25080064 + 24601600 = 5008^2 + 4960^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49681661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 96779 + ... + 97290.

Almost surely, 2^49681664 is an apocalyptic number.

It is an amenable number.

49681664 is a deficient number, since it is larger than the sum of its proper divisors (49488106).

49681664 is an equidigital number, since it uses as much as digits as its factorization.

49681664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194085 (or 194071 counting only the distinct ones).

The product of its digits is 248832, while the sum is 44.

The square root of 49681664 is about 7048.5221145996. The cubic root of 49681664 is about 367.6196448174.

The spelling of 49681664 in words is "forty-nine million, six hundred eighty-one thousand, six hundred sixty-four".