307640988 has 36 divisors (see below), whose sum is σ = 781155648. Its totient is φ = 102084480.

The previous prime is 307640987. The next prime is 307641001. The reversal of 307640988 is 889046703.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×307640988² = 189285954995232288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (307640981) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11133 + ... + 27188.

It is an arithmetic number, because the mean of its divisors is an integer number (21698768).

Almost surely, 2^307640988 is an apocalyptic number.

It is an amenable number.

307640988 is an abundant number, since it is smaller than the sum of its proper divisors (473514660).

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

307640988 is a wasteful number, since it uses less digits than its factorization.

307640988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38554 (or 38549 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 307640988 is about 17539.6974888394. The cubic root of 307640988 is about 675.0688456528.

The spelling of 307640988 in words is "three hundred seven million, six hundred forty thousand, nine hundred eighty-eight".