1620968550 has 24 divisors (see below), whose sum is σ = 4020002376. Its totient is φ = 432258240.

The previous prime is 1620968533. The next prime is 1620968563. The reversal of 1620968550 is 558690261.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5403079 + ... + 5403378.

It is an arithmetic number, because the mean of its divisors is an integer number (167500099).

Almost surely, 2^1620968550 is an apocalyptic number.

1620968550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1620968550 is an abundant number, since it is smaller than the sum of its proper divisors (2399033826).

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

1620968550 is a wasteful number, since it uses less digits than its factorization.

1620968550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10806472 (or 10806467 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 42.

The square root of 1620968550 is about 40261.2537062621. The cubic root of 1620968550 is about 1174.6943040573.

The spelling of 1620968550 in words is "one billion, six hundred twenty million, nine hundred sixty-eight thousand, five hundred fifty".