1620913845 has 32 divisors (see below), whose sum is σ = 2848665600. Its totient is φ = 783376704.

The previous prime is 1620913837. The next prime is 1620913867. The reversal of 1620913845 is 5483190261.

It is not a de Polignac number, because 1620913845 - 2³ = 1620913837 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 117085 + ... + 130194.

It is an arithmetic number, because the mean of its divisors is an integer number (89020800).

Almost surely, 2^1620913845 is an apocalyptic number.

1620913845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1620913845 is a deficient number, since it is larger than the sum of its proper divisors (1227751755).

1620913845 is a wasteful number, since it uses less digits than its factorization.

1620913845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247329.

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 1620913845 is about 40260.5743252627. The cubic root of 1620913845 is about 1174.6810892472.

The spelling of 1620913845 in words is "one billion, six hundred twenty million, nine hundred thirteen thousand, eight hundred forty-five".