87720953 has 2 divisors, whose sum is σ = 87720954. Its totient is φ = 87720952.

The previous prime is 87720949. The next prime is 87720973. The reversal of 87720953 is 35902778.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44582329 + 43138624 = 6677^2 + 6568^2 .

It is a cyclic number.

It is not a de Polignac number, because 87720953 - 2² = 87720949 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87720953.

It is not a weakly prime, because it can be changed into another prime (87720923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43860476 + 43860477.

It is an arithmetic number, because the mean of its divisors is an integer number (43860477).

Almost surely, 2^87720953 is an apocalyptic number.

It is an amenable number.

87720953 is a deficient number, since it is larger than the sum of its proper divisors (1).

87720953 is an equidigital number, since it uses as much as digits as its factorization.

87720953 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 105840, while the sum is 41.

The square root of 87720953 is about 9365.9464551107. The cubic root of 87720953 is about 444.3253725859.

The spelling of 87720953 in words is "eighty-seven million, seven hundred twenty thousand, nine hundred fifty-three".