87972545 has 4 divisors (see below), whose sum is σ = 105567060. Its totient is φ = 70378032.

The previous prime is 87972529. The next prime is 87972557. The reversal of 87972545 is 54527978.

It is a happy number.

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 58736896 + 29235649 = 7664^2 + 5407^2 .

It is a cyclic number.

It is not a de Polignac number, because 87972545 - 2⁴ = 87972529 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87972545.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8797250 + ... + 8797259.

It is an arithmetic number, because the mean of its divisors is an integer number (26391765).

Almost surely, 2^87972545 is an apocalyptic number.

It is an amenable number.

87972545 is a deficient number, since it is larger than the sum of its proper divisors (17594515).

87972545 is a wasteful number, since it uses less digits than its factorization.

87972545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17594514.

The product of its digits is 705600, while the sum is 47.

The square root of 87972545 is about 9379.3680490745. The cubic root of 87972545 is about 444.7497562014.

The spelling of 87972545 in words is "eighty-seven million, nine hundred seventy-two thousand, five hundred forty-five".