8121400572 has 24 divisors (see below), whose sum is σ = 19099150336. Its totient is φ = 2685817008.

The previous prime is 8121400537. The next prime is 8121400577. The reversal of 8121400572 is 2750041218.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8121400577) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2662978 + ... + 2666025.

Almost surely, 2^8121400572 is an apocalyptic number.

It is an amenable number.

8121400572 is an abundant number, since it is smaller than the sum of its proper divisors (10977749764).

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

8121400572 is a wasteful number, since it uses less digits than its factorization.

8121400572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5329137 (or 5329135 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 30.

The square root of 8121400572 is about 90118.8136406600. The cubic root of 8121400572 is about 2010.0659674892.

The spelling of 8121400572 in words is "eight billion, one hundred twenty-one million, four hundred thousand, five hundred seventy-two".