1421428407688 has 8 divisors (see below), whose sum is σ = 2665178264430. Its totient is φ = 710714203840.

The previous prime is 1421428407653. The next prime is 1421428407697. The reversal of 1421428407688 is 8867048241241.

It can be written as a sum of positive squares in only one way, i.e., 956683522404 + 464744885284 = 978102^2 + 681722^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 88839275473 + ... + 88839275488.

Almost surely, 2^{1421428407688} is an apocalyptic number.

It is an amenable number.

1421428407688 is a deficient number, since it is larger than the sum of its proper divisors (1243749856742).

1421428407688 is a wasteful number, since it uses less digits than its factorization.

1421428407688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177678550967 (or 177678550963 counting only the distinct ones).

The product of its (nonzero) digits is 5505024, while the sum is 55.

The spelling of 1421428407688 in words is "one trillion, four hundred twenty-one billion, four hundred twenty-eight million, four hundred seven thousand, six hundred eighty-eight".