1377628638 has 16 divisors (see below), whose sum is σ = 2781008640. Its totient is φ = 454917656.

The previous prime is 1377628621. The next prime is 1377628663. The reversal of 1377628638 is 8368267731.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1072278 + ... + 1073561.

It is an arithmetic number, because the mean of its divisors is an integer number (173813040).

Almost surely, 2^1377628638 is an apocalyptic number.

1377628638 is an abundant number, since it is smaller than the sum of its proper divisors (1403380002).

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

1377628638 is a wasteful number, since it uses less digits than its factorization.

1377628638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2145951.

The product of its digits is 2032128, while the sum is 51.

The square root of 1377628638 is about 37116.4200590520. The cubic root of 1377628638 is about 1112.6982049412.

The spelling of 1377628638 in words is "one billion, three hundred seventy-seven million, six hundred twenty-eight thousand, six hundred thirty-eight".