7639920 has 140 divisors (see below), whose sum is σ = 26835336.
Its totient is φ = 2021760.
The previous prime is 7639913. The next prime is 7639921. The reversal of 7639920 is 299367.
It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.
It is a Harshad number since it is a multiple of its sum of digits (36).
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (7639921) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 58255 + ... + 58385.
Almost surely, 27639920 is an apocalyptic number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 7639920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13417668).
7639920 is an abundant number, since it is smaller than the sum of its proper divisors (19195416).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
7639920 is a wasteful number, since it uses less digits than its factorization.
7639920 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 162 (or 141 counting only the distinct ones).
The product of its (nonzero) digits is 20412, while the sum is 36.
The square root of 7639920 is about 2764.0405206871.
The cubic root of 7639920 is about 196.9531526454.
The spelling of 7639920 in words is "seven million, six hundred thirty-nine thousand, nine hundred twenty".