2088781978 has 8 divisors (see below), whose sum is σ = 3134152980. Its totient is φ = 1044064320.

The previous prime is 2088781969. The next prime is 2088781987. The reversal of 2088781978 is 8791878802.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2088781969) and next prime (2088781987).

It can be written as a sum of positive squares in 2 ways, for example, as 2001041289 + 87740689 = 44733^2 + 9367^2 .

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

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, 155263 + ... + 168178.

Almost surely, 2^2088781978 is an apocalyptic number.

2088781978 is a deficient number, since it is larger than the sum of its proper divisors (1045371002).

2088781978 is a wasteful number, since it uses less digits than its factorization.

2088781978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326672.

The product of its (nonzero) digits is 3612672, while the sum is 58.

The square root of 2088781978 is about 45703.1943960157. The cubic root of 2088781978 is about 1278.2948441449.

The spelling of 2088781978 in words is "two billion, eighty-eight million, seven hundred eighty-one thousand, nine hundred seventy-eight".