1977148928 has 80 divisors (see below), whose sum is σ = 4045482144. Its totient is φ = 965099520.

The previous prime is 1977148913. The next prime is 1977148951. The reversal of 1977148928 is 8298417791.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4980026 + ... + 4980422.

Almost surely, 2^1977148928 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1977148928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2022741072).

1977148928 is an abundant number, since it is smaller than the sum of its proper divisors (2068333216).

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

1977148928 is an equidigital number, since it uses as much as digits as its factorization.

1977148928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 623 (or 607 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 56.

The square root of 1977148928 is about 44465.1428424558. The cubic root of 1977148928 is about 1255.1042337092.

The spelling of 1977148928 in words is "one billion, nine hundred seventy-seven million, one hundred forty-eight thousand, nine hundred twenty-eight".