157749640 has 32 divisors (see below), whose sum is σ = 370370880. Its totient is φ = 60356032.

The previous prime is 157749629. The next prime is 157749643. The reversal of 157749640 is 46947751.

It is not an unprimeable number, because it can be changed into a prime (157749643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84814 + ... + 86653.

It is an arithmetic number, because the mean of its divisors is an integer number (11574090).

Almost surely, 2^157749640 is an apocalyptic number.

157749640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

157749640 is an abundant number, since it is smaller than the sum of its proper divisors (212621240).

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

157749640 is a wasteful number, since it uses less digits than its factorization.

157749640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171501 (or 171497 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 43.

The square root of 157749640 is about 12559.8423556986. The cubic root of 157749640 is about 540.3263231101.

It can be divided in two parts, 1577496 and 40, that added together give a square (1577536 = 1256²).

The spelling of 157749640 in words is "one hundred fifty-seven million, seven hundred forty-nine thousand, six hundred forty".