307287640 has 64 divisors (see below), whose sum is σ = 768540960. Its totient is φ = 109624320.

The previous prime is 307287637. The next prime is 307287649. The reversal of 307287640 is 46782703.

It is a self number, because there is not a number n which added to its sum of digits gives 307287640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (307287649) 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, 16732 + ... + 29908.

Almost surely, 2^307287640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 307287640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (384270480).

307287640 is an abundant number, since it is smaller than the sum of its proper divisors (461253320).

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

307287640 is a wasteful number, since it uses less digits than its factorization.

307287640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13252 (or 13248 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 37.

The square root of 307287640 is about 17529.6217871351. The cubic root of 307287640 is about 674.8102914520.

The spelling of 307287640 in words is "three hundred seven million, two hundred eighty-seven thousand, six hundred forty".