161902872 has 24 divisors (see below), whose sum is σ = 438487140. Its totient is φ = 53967600.

The previous prime is 161902859. The next prime is 161902879. The reversal of 161902872 is 278209161.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161902879) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1124254 + ... + 1124397.

Almost surely, 2^161902872 is an apocalyptic number.

161902872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161902872 is an abundant number, since it is smaller than the sum of its proper divisors (276584268).

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

161902872 is a wasteful number, since it uses less digits than its factorization.

161902872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2248663 (or 2248656 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 161902872 is about 12724.1059410868. The cubic root of 161902872 is about 545.0272095946.

It can be divided in two parts, 1619028 and 72, that added together give a triangular number (1619100 = T₁₇₉₉).

The spelling of 161902872 in words is "one hundred sixty-one million, nine hundred two thousand, eight hundred seventy-two".