1720720650 has 48 divisors (see below), whose sum is σ = 4655335968. Its totient is φ = 417144000.

The previous prime is 1720720649. The next prime is 1720720667. The reversal of 1720720650 is 560270271.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 519781 + ... + 523080.

It is an arithmetic number, because the mean of its divisors is an integer number (96986166).

Almost surely, 2^1720720650 is an apocalyptic number.

1720720650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1720720650 is an abundant number, since it is smaller than the sum of its proper divisors (2934615318).

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

1720720650 is a wasteful number, since it uses less digits than its factorization.

1720720650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1042887 (or 1042882 counting only the distinct ones).

The product of its (nonzero) digits is 5880, while the sum is 30.

The square root of 1720720650 is about 41481.5700040391. The cubic root of 1720720650 is about 1198.3125936063.

The spelling of 1720720650 in words is "one billion, seven hundred twenty million, seven hundred twenty thousand, six hundred fifty".