675440781 has 4 divisors (see below), whose sum is σ = 900587712. Its totient is φ = 450293852.

The previous prime is 675440761. The next prime is 675440813. The reversal of 675440781 is 187044576.

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 675440781 - 2²⁶ = 608331917 is a prime.

It is a super-2 number, since 2×675440781² = 912440497275779922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (675440761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112573461 + ... + 112573466.

It is an arithmetic number, because the mean of its divisors is an integer number (225146928).

Almost surely, 2^675440781 is an apocalyptic number.

It is an amenable number.

675440781 is a deficient number, since it is larger than the sum of its proper divisors (225146931).

675440781 is a wasteful number, since it uses less digits than its factorization.

675440781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225146930.

The product of its (nonzero) digits is 188160, while the sum is 42.

The square root of 675440781 is about 25989.2435634437. The cubic root of 675440781 is about 877.3962208743.

The spelling of 675440781 in words is "six hundred seventy-five million, four hundred forty thousand, seven hundred eighty-one".