678620951 has 4 divisors (see below), whose sum is σ = 678675600. Its totient is φ = 678566304.

The previous prime is 678620933. The next prime is 678620963. The reversal of 678620951 is 159026876.

It is a semiprime because it is the product of two primes, 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 678620951 - 2²⁶ = 611512087 is a prime.

It is a super-2 number, since 2×678620951² = 921052790272288802, 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 (678620251) 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, 1295 + ... + 36863.

It is an arithmetic number, because the mean of its divisors is an integer number (169668900).

Almost surely, 2^678620951 is an apocalyptic number.

678620951 is the 13925-th centered heptagonal number.

678620951 is a deficient number, since it is larger than the sum of its proper divisors (54649).

678620951 is a wasteful number, since it uses less digits than its factorization.

678620951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54648.

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 678620951 is about 26050.3541434661. The cubic root of 678620951 is about 878.7710768727.

The spelling of 678620951 in words is "six hundred seventy-eight million, six hundred twenty thousand, nine hundred fifty-one".