1623516420 has 48 divisors (see below), whose sum is σ = 4590871488. Its totient is φ = 428649600.

The previous prime is 1623516409. The next prime is 1623516421. The reversal of 1623516420 is 246153261.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (1623516421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 127894 + ... + 140013.

It is an arithmetic number, because the mean of its divisors is an integer number (95643156).

Almost surely, 2^1623516420 is an apocalyptic number.

1623516420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1623516420 is an abundant number, since it is smaller than the sum of its proper divisors (2967355068).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1623516420 is a wasteful number, since it uses less digits than its factorization.

1623516420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268020 (or 268018 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 1623516420 is about 40292.8829943949. The cubic root of 1623516420 is about 1175.3094510135.

Adding to 1623516420 its reverse (246153261), we get a palindrome (1869669681).

The spelling of 1623516420 in words is "one billion, six hundred twenty-three million, five hundred sixteen thousand, four hundred twenty".