672781787 has 4 divisors (see below), whose sum is σ = 676162800. Its totient is φ = 669400776.

The previous prime is 672781777. The next prime is 672781801. The reversal of 672781787 is 787187276.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 672781787 - 2⁴ = 672781771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (672781727) 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, 1690208 + ... + 1690605.

It is an arithmetic number, because the mean of its divisors is an integer number (169040700).

Almost surely, 2^672781787 is an apocalyptic number.

672781787 is a deficient number, since it is larger than the sum of its proper divisors (3381013).

672781787 is a wasteful number, since it uses less digits than its factorization.

672781787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3381012.

The product of its digits is 1843968, while the sum is 53.

The square root of 672781787 is about 25938.0374546726. The cubic root of 672781787 is about 876.2433641133.

The spelling of 672781787 in words is "six hundred seventy-two million, seven hundred eighty-one thousand, seven hundred eighty-seven".