45381987 has 48 divisors (see below), whose sum is σ = 78020800. Its totient is φ = 25401600.

The previous prime is 45381979. The next prime is 45381997. The reversal of 45381987 is 78918354.

45381987 is a `hidden beast` number, since 453 + 8 + 198 + 7 = 666.

It is not a de Polignac number, because 45381987 - 2³ = 45381979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (45381997) 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, 188187 + ... + 188427.

Almost surely, 2^45381987 is an apocalyptic number.

45381987 is a deficient number, since it is larger than the sum of its proper divisors (32638813).

45381987 is a wasteful number, since it uses less digits than its factorization.

45381987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329 (or 312 counting only the distinct ones).

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

The square root of 45381987 is about 6736.6153964732. The cubic root of 45381987 is about 356.6929308791.

The spelling of 45381987 in words is "forty-five million, three hundred eighty-one thousand, nine hundred eighty-seven".