1621752090 has 32 divisors (see below), whose sum is σ = 4448234880. Its totient is φ = 370686144.

The previous prime is 1621752079. The next prime is 1621752091. The reversal of 1621752090 is 902571261.

It is not an unprimeable number, because it can be changed into a prime (1621752091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3861105 + ... + 3861524.

It is an arithmetic number, because the mean of its divisors is an integer number (139007340).

Almost surely, 2^1621752090 is an apocalyptic number.

1621752090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1621752090 is an abundant number, since it is smaller than the sum of its proper divisors (2826482790).

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

1621752090 is a wasteful number, since it uses less digits than its factorization.

1621752090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7722646.

The product of its (nonzero) digits is 7560, while the sum is 33.

The square root of 1621752090 is about 40270.9832261394. The cubic root of 1621752090 is about 1174.8835472336.

The spelling of 1621752090 in words is "one billion, six hundred twenty-one million, seven hundred fifty-two thousand, ninety".