677621493 has 6 divisors (see below), whose sum is σ = 978786614. Its totient is φ = 451747656.

The previous prime is 677621459. The next prime is 677621501. The reversal of 677621493 is 394126776.

It can be written as a sum of positive squares in only one way, i.e., 408727089 + 268894404 = 20217^2 + 16398^2 .

It is not a de Polignac number, because 677621493 - 2¹⁰ = 677620469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (677629493) by changing a digit.

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 in 5 ways as a sum of consecutive naturals, for example, 37645630 + ... + 37645647.

Almost surely, 2^677621493 is an apocalyptic number.

It is an amenable number.

677621493 is a deficient number, since it is larger than the sum of its proper divisors (301165121).

677621493 is a wasteful number, since it uses less digits than its factorization.

677621493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75291283 (or 75291280 counting only the distinct ones).

The product of its digits is 381024, while the sum is 45.

The square root of 677621493 is about 26031.1638810100. The cubic root of 677621493 is about 878.3394533414.

It can be divided in two parts, 677 and 621493, that added together give a triangular number (622170 = T₁₁₁₅).

The spelling of 677621493 in words is "six hundred seventy-seven million, six hundred twenty-one thousand, four hundred ninety-three".