673621718 has 48 divisors (see below), whose sum is σ = 1313616528. Its totient is φ = 256032000.

The previous prime is 673621717. The next prime is 673621733. The reversal of 673621718 is 817126376.

It is a super-2 number, since 2×673621718² = 907532437922543048, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (673621717) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36578 + ... + 51818.

It is an arithmetic number, because the mean of its divisors is an integer number (27367011).

Almost surely, 2^673621718 is an apocalyptic number.

673621718 is a deficient number, since it is larger than the sum of its proper divisors (639994810).

673621718 is a wasteful number, since it uses less digits than its factorization.

673621718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15309 (or 15302 counting only the distinct ones).

The product of its digits is 84672, while the sum is 41.

The square root of 673621718 is about 25954.2235098644. The cubic root of 673621718 is about 876.6078596615.

The spelling of 673621718 in words is "six hundred seventy-three million, six hundred twenty-one thousand, seven hundred eighteen".