620671679 has 4 divisors (see below), whose sum is σ = 620932800. Its totient is φ = 620410560.

The previous prime is 620671661. The next prime is 620671697. The reversal of 620671679 is 976176026.

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

It is an interprime number because it is at equal distance from previous prime (620671661) and next prime (620671697).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-620671679 is a prime.

It is a super-2 number, since 2×620671679² = 770466666225358082, 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 (620671619) 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, 126962 + ... + 131759.

It is an arithmetic number, because the mean of its divisors is an integer number (155233200).

Almost surely, 2^620671679 is an apocalyptic number.

620671679 is a deficient number, since it is larger than the sum of its proper divisors (261121).

620671679 is a wasteful number, since it uses less digits than its factorization.

620671679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261120.

The product of its (nonzero) digits is 190512, while the sum is 44.

The square root of 620671679 is about 24913.2831838760. The cubic root of 620671679 is about 853.0097129816.

The spelling of 620671679 in words is "six hundred twenty million, six hundred seventy-one thousand, six hundred seventy-nine".