84581801428 has 12 divisors (see below), whose sum is σ = 156725102772. Its totient is φ = 39803200640.

The previous prime is 84581801413. The next prime is 84581801443. The reversal of 84581801428 is 82410818548.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (84581801413) and next prime (84581801443).

It can be written as a sum of positive squares in 2 ways, for example, as 75252559684 + 9329241744 = 274322^2 + 96588^2 .

It is a super-2 number, since 2×84581801428² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 621924943 + ... + 621925078.

It is an arithmetic number, because the mean of its divisors is an integer number (13060425231).

Almost surely, 2^84581801428 is an apocalyptic number.

It is an amenable number.

84581801428 is a deficient number, since it is larger than the sum of its proper divisors (72143301344).

84581801428 is a wasteful number, since it uses less digits than its factorization.

84581801428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1243850042 (or 1243850040 counting only the distinct ones).

The product of its (nonzero) digits is 655360, while the sum is 49.

The spelling of 84581801428 in words is "eighty-four billion, five hundred eighty-one million, eight hundred one thousand, four hundred twenty-eight".