85240400240 has 20 divisors (see below), whose sum is σ = 198183930744. Its totient is φ = 34096160064.

The previous prime is 85240400209. The next prime is 85240400243. The reversal of 85240400240 is 4200404258.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85240400243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 532752422 + ... + 532752581.

Almost surely, 2^85240400240 is an apocalyptic number.

85240400240 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

85240400240 is an abundant number, since it is smaller than the sum of its proper divisors (112943530504).

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

85240400240 is a wasteful number, since it uses less digits than its factorization.

85240400240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1065505016 (or 1065505010 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 29.

Adding to 85240400240 its reverse (4200404258), we get a palindrome (89440804498).

The spelling of 85240400240 in words is "eighty-five billion, two hundred forty million, four hundred thousand, two hundred forty".