3728778698 has 4 divisors (see below), whose sum is σ = 5593168050. Its totient is φ = 1864389348.

The previous prime is 3728778679. The next prime is 3728778727. The reversal of 3728778698 is 8968778273.

It is a happy number.

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., 3662307289 + 66471409 = 60517^2 + 8153^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 932194673 + ... + 932194676.

Almost surely, 2^3728778698 is an apocalyptic number.

3728778698 is a deficient number, since it is larger than the sum of its proper divisors (1864389352).

3728778698 is a wasteful number, since it uses less digits than its factorization.

3728778698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1864389351.

The product of its digits is 56899584, while the sum is 65.

The square root of 3728778698 is about 61063.7265322057. The cubic root of 3728778698 is about 1550.6800620372.

The spelling of 3728778698 in words is "three billion, seven hundred twenty-eight million, seven hundred seventy-eight thousand, six hundred ninety-eight".