81474001400 has 48 divisors (see below), whose sum is σ = 206647700040. Its totient is φ = 29626908800.

The previous prime is 81474001379. The next prime is 81474001409. The reversal of 81474001400 is 410047418.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81474001409) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18514619 + ... + 18519018.

Almost surely, 2^81474001400 is an apocalyptic number.

It is an amenable number.

81474001400 is an abundant number, since it is smaller than the sum of its proper divisors (125173698640).

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

81474001400 is a wasteful number, since it uses less digits than its factorization.

81474001400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37033664 (or 37033655 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 29.

Adding to 81474001400 its reverse (410047418), we get a palindrome (81884048818).

The spelling of 81474001400 in words is "eighty-one billion, four hundred seventy-four million, one thousand, four hundred".