81254620 has 48 divisors (see below), whose sum is σ = 176033088. Its totient is φ = 31485440.

The previous prime is 81254573. The next prime is 81254629. The reversal of 81254620 is 2645218.

It is a super-3 number, since 3×81254620³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81254629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 161289 + ... + 161791.

It is an arithmetic number, because the mean of its divisors is an integer number (3667356).

Almost surely, 2^81254620 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81254620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88016544).

81254620 is an abundant number, since it is smaller than the sum of its proper divisors (94778468).

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

81254620 is a wasteful number, since it uses less digits than its factorization.

81254620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 750 (or 748 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 81254620 is about 9014.1344565077. The cubic root of 81254620 is about 433.1277617962.

Adding to 81254620 its reverse (2645218), we get a palindrome (83899838).

The spelling of 81254620 in words is "eighty-one million, two hundred fifty-four thousand, six hundred twenty".