81002487 has 8 divisors (see below), whose sum is σ = 108373104. Its totient is φ = 53816768.

The previous prime is 81002477. The next prime is 81002489. The reversal of 81002487 is 78420018.

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 81002487 - 2⁸ = 81002231 is a prime.

It is a super-2 number, since 2×81002487² = 13122805800370338, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81002489) 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, 45198 + ... + 46955.

It is an arithmetic number, because the mean of its divisors is an integer number (13546638).

Almost surely, 2^81002487 is an apocalyptic number.

81002487 is a deficient number, since it is larger than the sum of its proper divisors (27370617).

81002487 is a wasteful number, since it uses less digits than its factorization.

81002487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92449.

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 81002487 is about 9000.1381656061. The cubic root of 81002487 is about 432.6792992872.

The spelling of 81002487 in words is "eighty-one million, two thousand, four hundred eighty-seven".