87943815 has 48 divisors (see below), whose sum is σ = 159464448. Its totient is φ = 44791488.

The previous prime is 87943813. The next prime is 87943819. The reversal of 87943815 is 51834978.

It is not a de Polignac number, because 87943815 - 2¹ = 87943813 is a prime.

It is a super-2 number, since 2×87943815² = 15468229193508450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87943813) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 90462 + ... + 91428.

It is an arithmetic number, because the mean of its divisors is an integer number (3322176).

Almost surely, 2^87943815 is an apocalyptic number.

87943815 is a deficient number, since it is larger than the sum of its proper divisors (71520633).

87943815 is a wasteful number, since it uses less digits than its factorization.

87943815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1068 (or 1065 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 87943815 is about 9377.8363709333. The cubic root of 87943815 is about 444.7013355958.

The spelling of 87943815 in words is "eighty-seven million, nine hundred forty-three thousand, eight hundred fifteen".