1642047990 has 128 divisors (see below), whose sum is σ = 4471455744. Its totient is φ = 382320000.

The previous prime is 1642047983. The next prime is 1642047997. The reversal of 1642047990 is 997402461.

It is an interprime number because it is at equal distance from previous prime (1642047983) and next prime (1642047997).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1642047997) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1544199 + ... + 1545261.

It is an arithmetic number, because the mean of its divisors is an integer number (34933248).

Almost surely, 2^1642047990 is an apocalyptic number.

1642047990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1642047990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2235727872).

1642047990 is an abundant number, since it is smaller than the sum of its proper divisors (2829407754).

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

1642047990 is a wasteful number, since it uses less digits than its factorization.

1642047990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1266.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 1642047990 is about 40522.1913277157. The cubic root of 1642047990 is about 1179.7643860705.

The spelling of 1642047990 in words is "one billion, six hundred forty-two million, forty-seven thousand, nine hundred ninety".