749640 has 32 divisors (see below), whose sum is σ = 2249280. Its totient is φ = 199872.

The previous prime is 749587. The next prime is 749641. The reversal of 749640 is 46947.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 749598 and 749607.

It is not an unprimeable number, because it can be changed into a prime (749641) by changing a digit.

749640 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3004 + ... + 3243.

It is an arithmetic number, because the mean of its divisors is an integer number (70290).

2⁷⁴⁹⁶⁴⁰ is an apocalyptic number.

It is an amenable number.

749640 is an abundant number, since it is smaller than the sum of its proper divisors (1499640).

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

749640 is a wasteful number, since it uses less digits than its factorization.

749640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6261 (or 6257 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 749640 is about 865.8175327400. The cubic root of 749640 is about 90.8414903503.

The spelling of 749640 in words is "seven hundred forty-nine thousand, six hundred forty".