81279054 has 24 divisors (see below), whose sum is σ = 182178360. Its totient is φ = 26158608.

The previous prime is 81279041. The next prime is 81279061. The reversal of 81279054 is 45097218.

It is a congruent number.

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, 77332 + ... + 78375.

It is an arithmetic number, because the mean of its divisors is an integer number (7590765).

Almost surely, 2^81279054 is an apocalyptic number.

81279054 is an abundant number, since it is smaller than the sum of its proper divisors (100899306).

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

81279054 is a wasteful number, since it uses less digits than its factorization.

81279054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155744 (or 155741 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 81279054 is about 9015.4896705614. The cubic root of 81279054 is about 433.1711725918.

The spelling of 81279054 in words is "eighty-one million, two hundred seventy-nine thousand, fifty-four".