49691978 has 24 divisors (see below), whose sum is σ = 87088932. Its totient is φ = 21202944.

The previous prime is 49691963. The next prime is 49691987. The reversal of 49691978 is 87919694.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 48121969 + 1570009 = 6937^2 + 1253^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24200 + ... + 26172.

Almost surely, 2^49691978 is an apocalyptic number.

49691978 is a deficient number, since it is larger than the sum of its proper divisors (37396954).

49691978 is a wasteful number, since it uses less digits than its factorization.

49691978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2246 (or 2239 counting only the distinct ones).

The product of its digits is 979776, while the sum is 53.

The square root of 49691978 is about 7049.2537193663. The cubic root of 49691978 is about 367.6450825501.

The spelling of 49691978 in words is "forty-nine million, six hundred ninety-one thousand, nine hundred seventy-eight".