85401631540 has 48 divisors (see below), whose sum is σ = 186068703744. Its totient is φ = 32890838400.

The previous prime is 85401631529. The next prime is 85401631589. The reversal of 85401631540 is 4513610458.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 85401631540.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 227466 + ... + 471745.

It is an arithmetic number, because the mean of its divisors is an integer number (3876431328).

Almost surely, 2^85401631540 is an apocalyptic number.

It is an amenable number.

85401631540 is an abundant number, since it is smaller than the sum of its proper divisors (100667072204).

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

85401631540 is a wasteful number, since it uses less digits than its factorization.

85401631540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 699448 (or 699446 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 37.

The spelling of 85401631540 in words is "eighty-five billion, four hundred one million, six hundred thirty-one thousand, five hundred forty".