747640 has 16 divisors (see below), whose sum is σ = 1682280. Its totient is φ = 299040.

The previous prime is 747619. The next prime is 747647. The reversal of 747640 is 46747.

747640 = T₁₇₃ + T₁₇₄ + ... + T₂₁₂.

747640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 747599 and 747608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (747647) 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, 9306 + ... + 9385.

2⁷⁴⁷⁶⁴⁰ is an apocalyptic number.

It is an amenable number.

747640 is an abundant number, since it is smaller than the sum of its proper divisors (934640).

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

747640 is a wasteful number, since it uses less digits than its factorization.

747640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18702 (or 18698 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 28.

The square root of 747640 is about 864.6617835894. The cubic root of 747640 is about 90.7606316296.

The spelling of 747640 in words is "seven hundred forty-seven thousand, six hundred forty".