87320739 has 24 divisors (see below), whose sum is σ = 128567376. Its totient is φ = 52676800.

The previous prime is 87320729. The next prime is 87320743. The reversal of 87320739 is 93702378.

It is not a de Polignac number, because 87320739 - 2¹¹ = 87318691 is a prime.

It is a super-2 number, since 2×87320739² = 15249822919012242, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 87320697 and 87320706.

It is not an unprimeable number, because it can be changed into a prime (87320729) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 105949 + ... + 106769.

It is an arithmetic number, because the mean of its divisors is an integer number (5356974).

Almost surely, 2^87320739 is an apocalyptic number.

87320739 is a deficient number, since it is larger than the sum of its proper divisors (41246637).

87320739 is a wasteful number, since it uses less digits than its factorization.

87320739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1139 (or 1128 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 39.

The square root of 87320739 is about 9344.5566507994. The cubic root of 87320739 is about 443.6486191992.

It can be divided in two parts, 873 and 20739, that added together give a palindrome (21612).

The spelling of 87320739 in words is "eighty-seven million, three hundred twenty thousand, seven hundred thirty-nine".