16861608 has 40 divisors (see below), whose sum is σ = 47229930. Its totient is φ = 5620320.

The previous prime is 16861601. The next prime is 16861609. The reversal of 16861608 is 80616861.

It can be written as a sum of positive squares in only one way, i.e., 9474084 + 7387524 = 3078^2 + 2718^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (16861601) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 12363 + ... + 13658.

Almost surely, 2^16861608 is an apocalyptic number.

16861608 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

16861608 is an abundant number, since it is smaller than the sum of its proper divisors (30368322).

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

16861608 is a wasteful number, since it uses less digits than its factorization.

16861608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26039 (or 26026 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 16861608 is about 4106.2888354328. The cubic root of 16861608 is about 256.4285221989.

It can be divided in two parts, 168 and 61608, that added together give a triangular number (61776 = T₃₅₁).

The spelling of 16861608 in words is "sixteen million, eight hundred sixty-one thousand, six hundred eight".