620662421 has 4 divisors (see below), whose sum is σ = 621008844. Its totient is φ = 620316000.

The previous prime is 620662409. The next prime is 620662423. The reversal of 620662421 is 124266026.

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

It can be written as a sum of positive squares in 2 ways, for example, as 386908900 + 233753521 = 19670^2 + 15289^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-620662421 is a prime.

It is a super-3 number, since 3×620662421³ (a number of 27 digits) contains 333 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 (620662423) 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, 170510 + ... + 174111.

It is an arithmetic number, because the mean of its divisors is an integer number (155252211).

Almost surely, 2^620662421 is an apocalyptic number.

It is an amenable number.

620662421 is a deficient number, since it is larger than the sum of its proper divisors (346423).

620662421 is a wasteful number, since it uses less digits than its factorization.

620662421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346422.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 620662421 is about 24913.0973786882. The cubic root of 620662421 is about 853.0054717682.

The spelling of 620662421 in words is "six hundred twenty million, six hundred sixty-two thousand, four hundred twenty-one".