1977156960 has 48 divisors (see below), whose sum is σ = 6228045936. Its totient is φ = 527241728.

The previous prime is 1977156947. The next prime is 1977156971. The reversal of 1977156960 is 696517791.

It is a tau number, because it is divible by the number of its divisors (48).

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, 2059059 + ... + 2060018.

It is an arithmetic number, because the mean of its divisors is an integer number (129750957).

Almost surely, 2^1977156960 is an apocalyptic number.

1977156960 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1977156960 is an abundant number, since it is smaller than the sum of its proper divisors (4250888976).

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

1977156960 is a wasteful number, since it uses less digits than its factorization.

1977156960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4119095 (or 4119087 counting only the distinct ones).

The product of its (nonzero) digits is 714420, while the sum is 51.

The square root of 1977156960 is about 44465.2331603018. The cubic root of 1977156960 is about 1255.1059332917.

The spelling of 1977156960 in words is "one billion, nine hundred seventy-seven million, one hundred fifty-six thousand, nine hundred sixty".