3992651778 has 8 divisors (see below), whose sum is σ = 7985303568. Its totient is φ = 1330883924.

The previous prime is 3992651731. The next prime is 3992651801. The reversal of 3992651778 is 8771562993.

It is a sphenic number, since it is the product of 3 distinct primes.

3992651778 is an admirable number.

It is a super-2 number, since 2×3992651778² = 31882536440733122568, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 332720976 + ... + 332720987.

It is an arithmetic number, because the mean of its divisors is an integer number (998162946).

Almost surely, 2^3992651778 is an apocalyptic number.

3992651778 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

3992651778 is a wasteful number, since it uses less digits than its factorization.

3992651778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665441968.

The product of its digits is 5715360, while the sum is 57.

The square root of 3992651778 is about 63187.4337032293. The cubic root of 3992651778 is about 1586.4284081802.

The spelling of 3992651778 in words is "three billion, nine hundred ninety-two million, six hundred fifty-one thousand, seven hundred seventy-eight".