157640574 has 64 divisors (see below), whose sum is σ = 404941824. Its totient is φ = 39764736.

The previous prime is 157640543. The next prime is 157640579. The reversal of 157640574 is 475046751.

157640574 = 137² + 138² + ... + 780².

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157640579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6282 + ... + 18834.

It is an arithmetic number, because the mean of its divisors is an integer number (6327216).

Almost surely, 2^157640574 is an apocalyptic number.

157640574 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 157640574, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (202470912).

157640574 is an abundant number, since it is smaller than the sum of its proper divisors (247301250).

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

157640574 is a wasteful number, since it uses less digits than its factorization.

157640574 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12601.

The product of its (nonzero) digits is 117600, while the sum is 39.

The square root of 157640574 is about 12555.4997511051. The cubic root of 157640574 is about 540.2017695931.

The spelling of 157640574 in words is "one hundred fifty-seven million, six hundred forty thousand, five hundred seventy-four".