81374620 has 12 divisors (see below), whose sum is σ = 170886744. Its totient is φ = 32549840.

The previous prime is 81374617. The next prime is 81374639. The reversal of 81374620 is 2647318.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2034346 + ... + 2034385.

It is an arithmetic number, because the mean of its divisors is an integer number (14240562).

Almost surely, 2^81374620 is an apocalyptic number.

It is an amenable number.

81374620 is an abundant number, since it is smaller than the sum of its proper divisors (89512124).

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

81374620 is a wasteful number, since it uses less digits than its factorization.

81374620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4068740 (or 4068738 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 81374620 is about 9020.7882138979. The cubic root of 81374620 is about 433.3408769232.

The spelling of 81374620 in words is "eighty-one million, three hundred seventy-four thousand, six hundred twenty".