87649733 has 2 divisors, whose sum is σ = 87649734. Its totient is φ = 87649732.

The previous prime is 87649729. The next prime is 87649753. The reversal of 87649733 is 33794678.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86731969 + 917764 = 9313^2 + 958^2 .

It is a cyclic number.

It is not a de Polignac number, because 87649733 - 2² = 87649729 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87649753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43824866 + 43824867.

It is an arithmetic number, because the mean of its divisors is an integer number (43824867).

Almost surely, 2^87649733 is an apocalyptic number.

It is an amenable number.

87649733 is a deficient number, since it is larger than the sum of its proper divisors (1).

87649733 is an equidigital number, since it uses as much as digits as its factorization.

87649733 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 762048, while the sum is 47.

The square root of 87649733 is about 9362.1436113745. The cubic root of 87649733 is about 444.2050918552.

The spelling of 87649733 in words is "eighty-seven million, six hundred forty-nine thousand, seven hundred thirty-three".