1620344654 has 4 divisors (see below), whose sum is σ = 2430516984. Its totient is φ = 810172326.

The previous prime is 1620344653. The next prime is 1620344657. The reversal of 1620344654 is 4564430261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4564430261 = 36011 ⋅126751.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620344653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405086162 + ... + 405086165.

It is an arithmetic number, because the mean of its divisors is an integer number (607629246).

Almost surely, 2^1620344654 is an apocalyptic number.

1620344654 is a deficient number, since it is larger than the sum of its proper divisors (810172330).

1620344654 is an equidigital number, since it uses as much as digits as its factorization.

1620344654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810172329.

The product of its (nonzero) digits is 69120, while the sum is 35.

The square root of 1620344654 is about 40253.5048660362. The cubic root of 1620344654 is about 1174.5435750122.

The spelling of 1620344654 in words is "one billion, six hundred twenty million, three hundred forty-four thousand, six hundred fifty-four".