84671820 has 36 divisors (see below), whose sum is σ = 256838400. Its totient is φ = 22579104.

The previous prime is 84671803. The next prime is 84671837. The reversal of 84671820 is 2817648.

It is an interprime number because it is at equal distance from previous prime (84671803) and next prime (84671837).

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×84671820² = 14338634204224800, which contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 235020 + ... + 235379.

It is an arithmetic number, because the mean of its divisors is an integer number (7134400).

Almost surely, 2^84671820 is an apocalyptic number.

It is an amenable number.

84671820 is an abundant number, since it is smaller than the sum of its proper divisors (172166580).

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

84671820 is a wasteful number, since it uses less digits than its factorization.

84671820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470414 (or 470409 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 84671820 is about 9201.7291853216. The cubic root of 84671820 is about 439.1163740371.

It can be divided in two parts, 84671 and 820, that added together give a triangular number (85491 = T₄₁₃).

The spelling of 84671820 in words is "eighty-four million, six hundred seventy-one thousand, eight hundred twenty".