85400231540 has 24 divisors (see below), whose sum is σ = 193135908840. Its totient is φ = 31532393088.

The previous prime is 85400231471. The next prime is 85400231593. The reversal of 85400231540 is 4513200458.

It can be written as a sum of positive squares in 4 ways, for example, as 67305616 + 85332925924 = 8204^2 + 292118^2 .

It is a super-2 number, since 2×85400231540² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 85400231497 and 85400231506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 164230955 + ... + 164231474.

It is an arithmetic number, because the mean of its divisors is an integer number (8047329535).

Almost surely, 2^85400231540 is an apocalyptic number.

It is an amenable number.

85400231540 is an abundant number, since it is smaller than the sum of its proper divisors (107735677300).

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

85400231540 is a wasteful number, since it uses less digits than its factorization.

85400231540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328462451 (or 328462449 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 32.

Adding to 85400231540 its reverse (4513200458), we get a palindrome (89913431998).

The spelling of 85400231540 in words is "eighty-five billion, four hundred million, two hundred thirty-one thousand, five hundred forty".