87204920437 has 2 divisors, whose sum is σ = 87204920438. Its totient is φ = 87204920436.

The previous prime is 87204920431. The next prime is 87204920471. The reversal of 87204920437 is 73402940278.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87195593521 + 9326916 = 295289^2 + 3054^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87204920437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87204920431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43602460218 + 43602460219.

It is an arithmetic number, because the mean of its divisors is an integer number (43602460219).

Almost surely, 2^87204920437 is an apocalyptic number.

It is an amenable number.

87204920437 is a deficient number, since it is larger than the sum of its proper divisors (1).

87204920437 is an equidigital number, since it uses as much as digits as its factorization.

87204920437 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 677376, while the sum is 46.

The spelling of 87204920437 in words is "eighty-seven billion, two hundred four million, nine hundred twenty thousand, four hundred thirty-seven".