677981997 has 144 divisors (see below), whose sum is σ = 1345576960. Its totient is φ = 320760000.

The previous prime is 677981977. The next prime is 677982023. The reversal of 677981997 is 799189776.

677981997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 677981997 - 2¹⁸ = 677719853 is a prime.

It is a super-2 number, since 2×677981997² = 919319176512216018, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (677981917) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 4489872 + ... + 4490022.

Almost surely, 2^677981997 is an apocalyptic number.

It is an amenable number.

677981997 is a deficient number, since it is larger than the sum of its proper divisors (667594963).

677981997 is a wasteful number, since it uses less digits than its factorization.

677981997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236 (or 222 counting only the distinct ones).

The product of its digits is 12002256, while the sum is 63.

The square root of 677981997 is about 26038.0874297633. The cubic root of 677981997 is about 878.4951886366.

The spelling of 677981997 in words is "six hundred seventy-seven million, nine hundred eighty-one thousand, nine hundred ninety-seven".