706667557 has 4 divisors (see below), whose sum is σ = 706722976. Its totient is φ = 706612140.

The previous prime is 706667539. The next prime is 706667567. The reversal of 706667557 is 755766607.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 706667557 - 2²³ = 698278949 is a prime.

It is a super-2 number, since 2×706667557² = 998758072232696498, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 706667557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (706667527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2128 + ... + 37654.

It is an arithmetic number, because the mean of its divisors is an integer number (176680744).

Almost surely, 2^706667557 is an apocalyptic number.

It is an amenable number.

706667557 is a deficient number, since it is larger than the sum of its proper divisors (55419).

706667557 is a wasteful number, since it uses less digits than its factorization.

706667557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55418.

The product of its (nonzero) digits is 1852200, while the sum is 49.

The square root of 706667557 is about 26583.2194626610. The cubic root of 706667557 is about 890.7142173343.

The spelling of 706667557 in words is "seven hundred six million, six hundred sixty-seven thousand, five hundred fifty-seven".