85999015440 has 200 divisors, whose sum is σ = 321663584088. Its totient is φ = 21168967680.

The previous prime is 85999015423. The next prime is 85999015441. The reversal of 85999015440 is 4451099958.

85999015440 is a `hidden beast` number, since 8 + 5 + 9 + 9 + 90 + 1 + 544 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 400640256 + 85598375184 = 20016^2 + 292572^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (85999015441) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 426201 + ... + 594680.

Almost surely, 2^85999015440 is an apocalyptic number.

85999015440 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

85999015440 is an abundant number, since it is smaller than the sum of its proper divisors (235664568648).

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

85999015440 is a wasteful number, since it uses less digits than its factorization.

85999015440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1020919 (or 1020904 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 54.

The spelling of 85999015440 in words is "eighty-five billion, nine hundred ninety-nine million, fifteen thousand, four hundred forty".