81874667 has 8 divisors (see below), whose sum is σ = 98496000. Its totient is φ = 66484584.

The previous prime is 81874657. The next prime is 81874679. The reversal of 81874667 is 76647818.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81874667 - 2⁴ = 81874651 is a prime.

It is a super-2 number, since 2×81874667² = 13406922192721778, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81874657) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 307667 + ... + 307932.

It is an arithmetic number, because the mean of its divisors is an integer number (12312000).

Almost surely, 2^81874667 is an apocalyptic number.

81874667 is a deficient number, since it is larger than the sum of its proper divisors (16621333).

81874667 is a wasteful number, since it uses less digits than its factorization.

81874667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615625.

The product of its digits is 451584, while the sum is 47.

The square root of 81874667 is about 9048.4621345287. The cubic root of 81874667 is about 434.2266914422.

The spelling of 81874667 in words is "eighty-one million, eight hundred seventy-four thousand, six hundred sixty-seven".