85400861540 has 24 divisors (see below), whose sum is σ = 179424890232. Its totient is φ = 34144519680.

The previous prime is 85400861527. The next prime is 85400861647. The reversal of 85400861540 is 4516800458.

It can be written as a sum of positive squares in 4 ways, for example, as 14555457316 + 70845404224 = 120646^2 + 266168^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 944759 + ... + 1031198.

It is an arithmetic number, because the mean of its divisors is an integer number (7476037093).

Almost surely, 2^85400861540 is an apocalyptic number.

It is an amenable number.

85400861540 is an abundant number, since it is smaller than the sum of its proper divisors (94024028692).

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

85400861540 is a wasteful number, since it uses less digits than its factorization.

85400861540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1978127 (or 1978125 counting only the distinct ones).

The product of its (nonzero) digits is 153600, while the sum is 41.

The spelling of 85400861540 in words is "eighty-five billion, four hundred million, eight hundred sixty-one thousand, five hundred forty".