172661400 has 72 divisors (see below), whose sum is σ = 579860580. Its totient is φ = 46042560.

The previous prime is 172661393. The next prime is 172661407. The reversal of 172661400 is 4166271.

It is an interprime number because it is at equal distance from previous prime (172661393) and next prime (172661407).

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172661407) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 46162 + ... + 49761.

Almost surely, 2^172661400 is an apocalyptic number.

172661400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172661400 is an abundant number, since it is smaller than the sum of its proper divisors (407199180).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

172661400 is a wasteful number, since it uses less digits than its factorization.

172661400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95945 (or 95933 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 172661400 is about 13140.0684929722. The cubic root of 172661400 is about 556.8417025593.

The spelling of 172661400 in words is "one hundred seventy-two million, six hundred sixty-one thousand, four hundred".