87120742 has 4 divisors (see below), whose sum is σ = 130681116. Its totient is φ = 43560370.

The previous prime is 87120731. The next prime is 87120769. The reversal of 87120742 is 24702178.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21780184 + ... + 21780187.

It is an arithmetic number, because the mean of its divisors is an integer number (32670279).

Almost surely, 2^87120742 is an apocalyptic number.

87120742 is a deficient number, since it is larger than the sum of its proper divisors (43560374).

87120742 is a wasteful number, since it uses less digits than its factorization.

87120742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43560373.

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 87120742 is about 9333.8492595499. The cubic root of 87120742 is about 443.3096534484.

The spelling of 87120742 in words is "eighty-seven million, one hundred twenty thousand, seven hundred forty-two".