49815778 has 4 divisors (see below), whose sum is σ = 74723670. Its totient is φ = 24907888.

The previous prime is 49815757. The next prime is 49815781. The reversal of 49815778 is 87751894.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 46881409 + 2934369 = 6847^2 + 1713^2 .

It is a super-2 number, since 2×49815778² = 4963223475490568, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12453943 + ... + 12453946.

Almost surely, 2^49815778 is an apocalyptic number.

49815778 is a deficient number, since it is larger than the sum of its proper divisors (24907892).

49815778 is a wasteful number, since it uses less digits than its factorization.

49815778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24907891.

The product of its digits is 564480, while the sum is 49.

The square root of 49815778 is about 7058.0293283607. The cubic root of 49815778 is about 367.9501399445.

The spelling of 49815778 in words is "forty-nine million, eight hundred fifteen thousand, seven hundred seventy-eight".