620915691 has 8 divisors (see below), whose sum is σ = 903150144. Its totient is φ = 376312520.

The previous prime is 620915683. The next prime is 620915693. The reversal of 620915691 is 196519026.

620915691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 620915691 - 2³ = 620915683 is a prime.

It is not an unprimeable number, because it can be changed into a prime (620915693) 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, 9407781 + ... + 9407846.

It is an arithmetic number, because the mean of its divisors is an integer number (112893768).

Almost surely, 2^620915691 is an apocalyptic number.

620915691 is a deficient number, since it is larger than the sum of its proper divisors (282234453).

620915691 is a wasteful number, since it uses less digits than its factorization.

620915691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18815641.

The product of its (nonzero) digits is 29160, while the sum is 39.

The square root of 620915691 is about 24918.1799295213. The cubic root of 620915691 is about 853.1214829358.

The spelling of 620915691 in words is "six hundred twenty million, nine hundred fifteen thousand, six hundred ninety-one".