619991970 has 64 divisors (see below), whose sum is σ = 1611477504. Its totient is φ = 151752960.

The previous prime is 619991969. The next prime is 619991987. The reversal of 619991970 is 79199916.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 66199 + ... + 74981.

It is an arithmetic number, because the mean of its divisors is an integer number (25179336).

Almost surely, 2^619991970 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 619991970, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (805738752).

619991970 is an abundant number, since it is smaller than the sum of its proper divisors (991485534).

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

619991970 is a wasteful number, since it uses less digits than its factorization.

619991970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8987.

The product of its (nonzero) digits is 275562, while the sum is 51.

The square root of 619991970 is about 24899.6379491751. The cubic root of 619991970 is about 852.6982170240.

The spelling of 619991970 in words is "six hundred nineteen million, nine hundred ninety-one thousand, nine hundred seventy".