1997777528 has 8 divisors (see below), whose sum is σ = 3745832880. Its totient is φ = 998888760.

The previous prime is 1997777503. The next prime is 1997777533. The reversal of 1997777528 is 8257777991.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×1997777528² = 7982230102763581568, which 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 (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124861088 + ... + 124861103.

It is an arithmetic number, because the mean of its divisors is an integer number (468229110).

Almost surely, 2^1997777528 is an apocalyptic number.

It is an amenable number.

1997777528 is a deficient number, since it is larger than the sum of its proper divisors (1748055352).

1997777528 is a wasteful number, since it uses less digits than its factorization.

1997777528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249722197 (or 249722193 counting only the distinct ones).

The product of its digits is 15558480, while the sum is 62.

The square root of 1997777528 is about 44696.5046508113. The cubic root of 1997777528 is about 1259.4541870446.

The spelling of 1997777528 in words is "one billion, nine hundred ninety-seven million, seven hundred seventy-seven thousand, five hundred twenty-eight".