81554862 has 16 divisors (see below), whose sum is σ = 168371712. Its totient is φ = 26307960.

The previous prime is 81554843. The next prime is 81554909. The reversal of 81554862 is 26845518.

It is a self number, because there is not a number n which added to its sum of digits gives 81554862.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 219048 + ... + 219419.

It is an arithmetic number, because the mean of its divisors is an integer number (10523232).

Almost surely, 2^81554862 is an apocalyptic number.

81554862 is an abundant number, since it is smaller than the sum of its proper divisors (86816850).

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

81554862 is a wasteful number, since it uses less digits than its factorization.

81554862 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438503.

The product of its digits is 76800, while the sum is 39.

The square root of 81554862 is about 9030.7730566104. The cubic root of 81554862 is about 433.6605860646.

The spelling of 81554862 in words is "eighty-one million, five hundred fifty-four thousand, eight hundred sixty-two".