28307961 has 20 divisors (see below), whose sum is σ = 46132944. Its totient is φ = 17155800.

The previous prime is 28307953. The next prime is 28307987. The reversal of 28307961 is 16970382.

It is not a de Polignac number, because 28307961 - 2³ = 28307953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28307911) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 14995 + ... + 16776.

Almost surely, 2^28307961 is an apocalyptic number.

It is an amenable number.

28307961 is a deficient number, since it is larger than the sum of its proper divisors (17824983).

28307961 is a wasteful number, since it uses less digits than its factorization.

28307961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31794 (or 31785 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 28307961 is about 5320.5226247052. The cubic root of 28307961 is about 304.7681154260.

The spelling of 28307961 in words is "twenty-eight million, three hundred seven thousand, nine hundred sixty-one".