287660397 has 4 divisors (see below), whose sum is σ = 383547200. Its totient is φ = 191773596.

The previous prime is 287660363. The next prime is 287660431. The reversal of 287660397 is 793066782.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (287660363) and next prime (287660431).

It is not a de Polignac number, because 287660397 - 2¹⁴ = 287644013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (287660327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47943397 + ... + 47943402.

It is an arithmetic number, because the mean of its divisors is an integer number (95886800).

Almost surely, 2^287660397 is an apocalyptic number.

It is an amenable number.

287660397 is a deficient number, since it is larger than the sum of its proper divisors (95886803).

287660397 is an equidigital number, since it uses as much as digits as its factorization.

287660397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95886802.

The product of its (nonzero) digits is 762048, while the sum is 48.

The square root of 287660397 is about 16960.5541477866. The cubic root of 287660397 is about 660.1257772227.

The spelling of 287660397 in words is "two hundred eighty-seven million, six hundred sixty thousand, three hundred ninety-seven".