1577320538428 has 24 divisors (see below), whose sum is σ = 2977827127632. Its totient is φ = 728263421184.

The previous prime is 1577320538419. The next prime is 1577320538449. The reversal of 1577320538428 is 8248350237751.

It is a happy number.

It is a super-2 number, since 2×1577320538428² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 218825550 + ... + 218832757.

It is an arithmetic number, because the mean of its divisors is an integer number (124076130318).

Almost surely, 2^{1577320538428} is an apocalyptic number.

It is an amenable number.

1577320538428 is a deficient number, since it is larger than the sum of its proper divisors (1400506589204).

1577320538428 is a wasteful number, since it uses less digits than its factorization.

1577320538428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437658381 (or 437658379 counting only the distinct ones).

The product of its (nonzero) digits is 11289600, while the sum is 55.

The spelling of 1577320538428 in words is "one trillion, five hundred seventy-seven billion, three hundred twenty million, five hundred thirty-eight thousand, four hundred twenty-eight".