87972029 has 4 divisors (see below), whose sum is σ = 88010076. Its totient is φ = 87933984.

The previous prime is 87971999. The next prime is 87972037. The reversal of 87972029 is 92027978.

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

It can be written as a sum of positive squares in 2 ways, for example, as 39000025 + 48972004 = 6245^2 + 6998^2 .

It is a cyclic number.

It is not a de Polignac number, because 87972029 - 2²⁰ = 86923453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87972329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15314 + ... + 20259.

It is an arithmetic number, because the mean of its divisors is an integer number (22002519).

Almost surely, 2^87972029 is an apocalyptic number.

It is an amenable number.

87972029 is a deficient number, since it is larger than the sum of its proper divisors (38047).

87972029 is a wasteful number, since it uses less digits than its factorization.

87972029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38046.

The product of its (nonzero) digits is 127008, while the sum is 44.

The square root of 87972029 is about 9379.3405418505. The cubic root of 87972029 is about 444.7488866448.

The spelling of 87972029 in words is "eighty-seven million, nine hundred seventy-two thousand, twenty-nine".