304649040 has 80 divisors (see below), whose sum is σ = 994132800. Its totient is φ = 76962816.

The previous prime is 304649039. The next prime is 304649041. The reversal of 304649040 is 40946403.

It is an interprime number because it is at equal distance from previous prime (304649039) and next prime (304649041).

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×304649040² = 185622075145843200, which contains 22 as substring.

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 = 304648989 and 304649007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (304649041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28845 + ... + 37964.

It is an arithmetic number, because the mean of its divisors is an integer number (12426660).

Almost surely, 2^304649040 is an apocalyptic number.

304649040 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

304649040 is an abundant number, since it is smaller than the sum of its proper divisors (689483760).

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

304649040 is a wasteful number, since it uses less digits than its factorization.

304649040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66844 (or 66838 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 304649040 is about 17454.1983488214. The cubic root of 304649040 is about 672.8732623818.

The spelling of 304649040 in words is "three hundred four million, six hundred forty-nine thousand, forty".