1377637668 has 36 divisors (see below), whose sum is σ = 3798941328. Its totient is φ = 417465840.

The previous prime is 1377637661. The next prime is 1377637673. The reversal of 1377637668 is 8667367731.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (1377637661) 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, 1739046 + ... + 1739837.

It is an arithmetic number, because the mean of its divisors is an integer number (105526148).

Almost surely, 2^1377637668 is an apocalyptic number.

1377637668 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1377637668 is an abundant number, since it is smaller than the sum of its proper divisors (2421303660).

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

1377637668 is a wasteful number, since it uses less digits than its factorization.

1377637668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3478904 (or 3478899 counting only the distinct ones).

The product of its digits is 5334336, while the sum is 54.

The square root of 1377637668 is about 37116.5417031275. The cubic root of 1377637668 is about 1112.7006360857.

The spelling of 1377637668 in words is "one billion, three hundred seventy-seven million, six hundred thirty-seven thousand, six hundred sixty-eight".