87640451 has 2 divisors, whose sum is σ = 87640452. Its totient is φ = 87640450.

The previous prime is 87640439. The next prime is 87640471. The reversal of 87640451 is 15404678.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87640451 - 2¹⁸ = 87378307 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87640471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43820225 + 43820226.

It is an arithmetic number, because the mean of its divisors is an integer number (43820226).

Almost surely, 2^87640451 is an apocalyptic number.

87640451 is a deficient number, since it is larger than the sum of its proper divisors (1).

87640451 is an equidigital number, since it uses as much as digits as its factorization.

87640451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 87640451 is about 9361.6478784453. The cubic root of 87640451 is about 444.1894110422.

The spelling of 87640451 in words is "eighty-seven million, six hundred forty thousand, four hundred fifty-one".