153731640 has 32 divisors (see below), whose sum is σ = 461195280. Its totient is φ = 40995072.

The previous prime is 153731621. The next prime is 153731647. The reversal of 153731640 is 46137351.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 153731598 and 153731607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (153731647) 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, 640429 + ... + 640668.

Almost surely, 2^153731640 is an apocalyptic number.

153731640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

153731640 is an abundant number, since it is smaller than the sum of its proper divisors (307463640).

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

153731640 is a wasteful number, since it uses less digits than its factorization.

153731640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1281111 (or 1281107 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 153731640 is about 12398.8563988781. The cubic root of 153731640 is about 535.6993097020.

Adding to 153731640 its reverse (46137351), we get a palindrome (199868991).

The spelling of 153731640 in words is "one hundred fifty-three million, seven hundred thirty-one thousand, six hundred forty".