900978778 has 48 divisors (see below), whose sum is σ = 1600953984. Its totient is φ = 379115520.

The previous prime is 900978769. The next prime is 900978781. The reversal of 900978778 is 877879009.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2090223 + ... + 2090653.

It is an arithmetic number, because the mean of its divisors is an integer number (33353208).

Almost surely, 2^900978778 is an apocalyptic number.

900978778 is a gapful number since it is divisible by the number (98) formed by its first and last digit.

900978778 is a deficient number, since it is larger than the sum of its proper divisors (699975206).

900978778 is a wasteful number, since it uses less digits than its factorization.

900978778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 787 (or 780 counting only the distinct ones).

The product of its (nonzero) digits is 1778112, while the sum is 55.

The square root of 900978778 is about 30016.3085338621. The cubic root of 900978778 is about 965.8392577180.

The spelling of 900978778 in words is "nine hundred million, nine hundred seventy-eight thousand, seven hundred seventy-eight".