81600204 has 48 divisors (see below), whose sum is σ = 230404608. Its totient is φ = 21942528.

The previous prime is 81600163. The next prime is 81600263. The reversal of 81600204 is 40200618.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27144 + ... + 29999.

It is an arithmetic number, because the mean of its divisors is an integer number (4800096).

Almost surely, 2^81600204 is an apocalyptic number.

81600204 is a gapful number since it is divisible by the number (84) formed by its first and last digit.

It is an amenable number.

81600204 is an abundant number, since it is smaller than the sum of its proper divisors (148804404).

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

81600204 is a wasteful number, since it uses less digits than its factorization.

81600204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57174 (or 57172 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 81600204 is about 9033.2831240917. The cubic root of 81600204 is about 433.7409385002.

It can be divided in two parts, 81600 and 204, that multiplied together give a square (16646400 = 4080²).

The spelling of 81600204 in words is "eighty-one million, six hundred thousand, two hundred four".