307493640 has 48 divisors (see below), whose sum is σ = 999355500. Its totient is φ = 81998208.

The previous prime is 307493639. The next prime is 307493657. The reversal of 307493640 is 46394703.

307493640 is a `hidden beast` number, since 3 + 0 + 7 + 4 + 9 + 3 + 640 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 247307076 + 60186564 = 15726^2 + 7758^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 307493595 and 307493604.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 426715 + ... + 427434.

Almost surely, 2^307493640 is an apocalyptic number.

307493640 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

307493640 is an abundant number, since it is smaller than the sum of its proper divisors (691861860).

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

307493640 is a wasteful number, since it uses less digits than its factorization.

307493640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 854166 (or 854159 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 36.

The square root of 307493640 is about 17535.4965712409. The cubic root of 307493640 is about 674.9610512506.

The spelling of 307493640 in words is "three hundred seven million, four hundred ninety-three thousand, six hundred forty".