620990545 has 16 divisors (see below), whose sum is σ = 852657408. Its totient is φ = 425315520.

The previous prime is 620990537. The next prime is 620990581. The reversal of 620990545 is 545099026.

It is not a de Polignac number, because 620990545 - 2³ = 620990537 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 620990498 and 620990507.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20580 + ... + 40810.

It is an arithmetic number, because the mean of its divisors is an integer number (53291088).

Almost surely, 2^620990545 is an apocalyptic number.

It is an amenable number.

620990545 is a deficient number, since it is larger than the sum of its proper divisors (231666863).

620990545 is a wasteful number, since it uses less digits than its factorization.

620990545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21120.

The product of its (nonzero) digits is 97200, while the sum is 40.

The square root of 620990545 is about 24919.6818799920. The cubic root of 620990545 is about 853.1557640201.

The spelling of 620990545 in words is "six hundred twenty million, nine hundred ninety thousand, five hundred forty-five".