164401587 has 24 divisors (see below), whose sum is σ = 280151040. Its totient is φ = 90912240.

The previous prime is 164401583. The next prime is 164401591. The reversal of 164401587 is 785104461.

It is a happy number.

164401587 is a `hidden beast` number, since 1 + 644 + 0 + 1 + 5 + 8 + 7 = 666.

164401587 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (164401583) and next prime (164401591).

It is not a de Polignac number, because 164401587 - 2² = 164401583 is a prime.

It is a super-3 number, since 3×164401587³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (164401583) 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, 40137 + ... + 44042.

It is an arithmetic number, because the mean of its divisors is an integer number (11672960).

Almost surely, 2^164401587 is an apocalyptic number.

164401587 is a deficient number, since it is larger than the sum of its proper divisors (115749453).

164401587 is a wasteful number, since it uses less digits than its factorization.

164401587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84223 (or 84220 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 164401587 is about 12821.9182262250. The cubic root of 164401587 is about 547.8167854586.

The spelling of 164401587 in words is "one hundred sixty-four million, four hundred one thousand, five hundred eighty-seven".