1721620074 has 32 divisors (see below), whose sum is σ = 3528645120. Its totient is φ = 559806192.

The previous prime is 1721620051. The next prime is 1721620079. The reversal of 1721620074 is 4700261271.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1721620079) 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, 20617 + ... + 62195.

It is an arithmetic number, because the mean of its divisors is an integer number (110270160).

Almost surely, 2^1721620074 is an apocalyptic number.

1721620074 is an abundant number, since it is smaller than the sum of its proper divisors (1807025046).

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

1721620074 is a wasteful number, since it uses less digits than its factorization.

1721620074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41754.

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 1721620074 is about 41492.4098360170. The cubic root of 1721620074 is about 1198.5213440065.

The spelling of 1721620074 in words is "one billion, seven hundred twenty-one million, six hundred twenty thousand, seventy-four".