1977661232 has 20 divisors (see below), whose sum is σ = 3833400480. Its totient is φ = 988396608.

The previous prime is 1977661223. The next prime is 1977661241. The reversal of 1977661232 is 2321667791.

It is an interprime number because it is at equal distance from previous prime (1977661223) and next prime (1977661241).

It is a super-2 number, since 2×1977661232² = 7822287897111515648, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12194 + ... + 64062.

It is an arithmetic number, because the mean of its divisors is an integer number (191670024).

Almost surely, 2^1977661232 is an apocalyptic number.

It is an amenable number.

1977661232 is a deficient number, since it is larger than the sum of its proper divisors (1855739248).

1977661232 is a wasteful number, since it uses less digits than its factorization.

1977661232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54260 (or 54254 counting only the distinct ones).

The product of its digits is 190512, while the sum is 44.

The square root of 1977661232 is about 44470.9032064787. The cubic root of 1977661232 is about 1255.2126287458.

The spelling of 1977661232 in words is "one billion, nine hundred seventy-seven million, six hundred sixty-one thousand, two hundred thirty-two".