658978949 has 8 divisors (see below), whose sum is σ = 664920960. Its totient is φ = 653058000.

The previous prime is 658978933. The next prime is 658978979. The reversal of 658978949 is 949879856.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 658978949 - 2⁴ = 658978933 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (658978979) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61319 + ... + 71259.

It is an arithmetic number, because the mean of its divisors is an integer number (83115120).

Almost surely, 2^658978949 is an apocalyptic number.

It is an amenable number.

658978949 is a deficient number, since it is larger than the sum of its proper divisors (5942011).

658978949 is a wasteful number, since it uses less digits than its factorization.

658978949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10531.

The product of its digits is 39191040, while the sum is 65.

The square root of 658978949 is about 25670.5852874452. The cubic root of 658978949 is about 870.2095540486.

The spelling of 658978949 in words is "six hundred fifty-eight million, nine hundred seventy-eight thousand, nine hundred forty-nine".