688421377 has 8 divisors (see below), whose sum is σ = 787070592. Its totient is φ = 589848000.

The previous prime is 688421369. The next prime is 688421387. The reversal of 688421377 is 773124886.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 688421377 - 2³ = 688421369 is a prime.

It is a super-2 number, since 2×688421377² = 947847984621152258, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (688421387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2052 + ... + 37162.

It is an arithmetic number, because the mean of its divisors is an integer number (98383824).

Almost surely, 2^688421377 is an apocalyptic number.

It is an amenable number.

688421377 is a deficient number, since it is larger than the sum of its proper divisors (98649215).

688421377 is a wasteful number, since it uses less digits than its factorization.

688421377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37919.

The product of its digits is 451584, while the sum is 46.

The square root of 688421377 is about 26237.7852914456. The cubic root of 688421377 is about 882.9811844048.

The spelling of 688421377 in words is "six hundred eighty-eight million, four hundred twenty-one thousand, three hundred seventy-seven".