7640020 has 12 divisors (see below), whose sum is σ = 16044084. Its totient is φ = 3056000.

The previous prime is 7639999. The next prime is 7640023. The reversal of 7640020 is 200467.

It can be written as a sum of positive squares in 2 ways, for example, as 2702736 + 4937284 = 1644^2 + 2222^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 7640020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7640023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 190981 + ... + 191020.

It is an arithmetic number, because the mean of its divisors is an integer number (1337007).

Almost surely, 2^7640020 is an apocalyptic number.

It is an amenable number.

7640020 is an abundant number, since it is smaller than the sum of its proper divisors (8404064).

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

7640020 is a wasteful number, since it uses less digits than its factorization.

7640020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382010 (or 382008 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 7640020 is about 2764.0586100877. The cubic root of 7640020 is about 196.9540119576.

Adding to 7640020 its reverse (200467), we get a palindrome (7840487).

The spelling of 7640020 in words is "seven million, six hundred forty thousand, twenty".