670400749 has 4 divisors (see below), whose sum is σ = 670724064. Its totient is φ = 670077436.

The previous prime is 670400741. The next prime is 670400779. The reversal of 670400749 is 947004076.

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.

It is a cyclic number.

It is not a de Polignac number, because 670400749 - 2³ = 670400741 is a prime.

It is a super-2 number, since 2×670400749² = 898874328519522002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (670400741) 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 3 ways as a sum of consecutive naturals, for example, 158527 + ... + 162700.

It is an arithmetic number, because the mean of its divisors is an integer number (167681016).

Almost surely, 2^670400749 is an apocalyptic number.

It is an amenable number.

670400749 is a deficient number, since it is larger than the sum of its proper divisors (323315).

670400749 is a wasteful number, since it uses less digits than its factorization.

670400749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323314.

The product of its (nonzero) digits is 42336, while the sum is 37.

The square root of 670400749 is about 25892.0981961679. The cubic root of 670400749 is about 875.2084397028.

The spelling of 670400749 in words is "six hundred seventy million, four hundred thousand, seven hundred forty-nine".