16320978 has 24 divisors (see below), whose sum is σ = 35438988. Its totient is φ = 5428512.

The previous prime is 16320971. The next prime is 16320989. The reversal of 16320978 is 87902361.

16320978 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 13198689 + 3122289 = 3633^2 + 1767^2 .

It is not an unprimeable number, because it can be changed into a prime (16320971) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12576 + ... + 13812.

Almost surely, 2^16320978 is an apocalyptic number.

16320978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

16320978 is an abundant number, since it is smaller than the sum of its proper divisors (19118010).

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

16320978 is a wasteful number, since it uses less digits than its factorization.

16320978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1978 (or 1975 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 16320978 is about 4039.9230190686. The cubic root of 16320978 is about 253.6580949578.

The spelling of 16320978 in words is "sixteen million, three hundred twenty thousand, nine hundred seventy-eight".