747255640 has 32 divisors (see below), whose sum is σ = 1701589680. Its totient is φ = 295299712.

The previous prime is 747255637. The next prime is 747255643. The reversal of 747255640 is 46552747.

It is an interprime number because it is at equal distance from previous prime (747255637) and next prime (747255643).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 747255593 and 747255602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (747255643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109219 + ... + 115858.

Almost surely, 2^747255640 is an apocalyptic number.

It is an amenable number.

747255640 is an abundant number, since it is smaller than the sum of its proper divisors (954334040).

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

747255640 is a wasteful number, since it uses less digits than its factorization.

747255640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225171 (or 225167 counting only the distinct ones).

The product of its (nonzero) digits is 235200, while the sum is 40.

The square root of 747255640 is about 27335.9770266219. The cubic root of 747255640 is about 907.4507568643.

The spelling of 747255640 in words is "seven hundred forty-seven million, two hundred fifty-five thousand, six hundred forty".