81050424 has 256 divisors, whose sum is σ = 275788800. Its totient is φ = 19243008.

The previous prime is 81050423. The next prime is 81050443. The reversal of 81050424 is 42405018.

81050424 = T₃₇₁ + T₃₇₂ + ... + T₈₁₂.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 81050394 and 81050403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81050423) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1373707 + ... + 1373765.

It is an arithmetic number, because the mean of its divisors is an integer number (1077300).

Almost surely, 2^81050424 is an apocalyptic number.

81050424 is a gapful number since it is divisible by the number (84) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81050424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (137894400).

81050424 is an abundant number, since it is smaller than the sum of its proper divisors (194738376).

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

81050424 is a wasteful number, since it uses less digits than its factorization.

81050424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142 (or 138 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 81050424 is about 9002.8008974985. The cubic root of 81050424 is about 432.7646351748.

The spelling of 81050424 in words is "eighty-one million, fifty thousand, four hundred twenty-four".