1977628 has 6 divisors (see below), whose sum is σ = 3460856. Its totient is φ = 988812.

The previous prime is 1977623. The next prime is 1977631. The reversal of 1977628 is 8267791.

It is a super-2 number, since 2×1977628² = 7822025012768, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1977623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247200 + ... + 247207.

2^1977628 is an apocalyptic number.

It is an amenable number.

1977628 is a deficient number, since it is larger than the sum of its proper divisors (1483228).

1977628 is a wasteful number, since it uses less digits than its factorization.

1977628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494411 (or 494409 counting only the distinct ones).

The product of its digits is 42336, while the sum is 40.

The square root of 1977628 is about 1406.2816218667. The cubic root of 1977628 is about 125.5205597973.

The spelling of 1977628 in words is "one million, nine hundred seventy-seven thousand, six hundred twenty-eight".