157784172 has 192 divisors, whose sum is σ = 481689600. Its totient is φ = 39087360.

The previous prime is 157784167. The next prime is 157784173. The reversal of 157784172 is 271487751.

157784172 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (42).

Its product of digits (109760) is a multiple of the sum of its prime factors (196).

It is not an unprimeable number, because it can be changed into a prime (157784173) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1997229 + ... + 1997307.

It is an arithmetic number, because the mean of its divisors is an integer number (2508800).

Almost surely, 2^157784172 is an apocalyptic number.

157784172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 157784172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (240844800).

157784172 is an abundant number, since it is smaller than the sum of its proper divisors (323905428).

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

157784172 is a wasteful number, since it uses less digits than its factorization.

157784172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196 (or 194 counting only the distinct ones).

The product of its digits is 109760, while the sum is 42.

The square root of 157784172 is about 12561.2169792580. The cubic root of 157784172 is about 540.3657467336.

The spelling of 157784172 in words is "one hundred fifty-seven million, seven hundred eighty-four thousand, one hundred seventy-two".