137631720 has 32 divisors (see below), whose sum is σ = 412895520. Its totient is φ = 36701760.

The previous prime is 137631671. The next prime is 137631721. The reversal of 137631720 is 27136731.

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

It is not an unprimeable number, because it can be changed into a prime (137631721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 573346 + ... + 573585.

It is an arithmetic number, because the mean of its divisors is an integer number (12902985).

Almost surely, 2^137631720 is an apocalyptic number.

137631720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

137631720 is an abundant number, since it is smaller than the sum of its proper divisors (275263800).

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

137631720 is a wasteful number, since it uses less digits than its factorization.

137631720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1146945 (or 1146941 counting only the distinct ones).

The product of its (nonzero) digits is 5292, while the sum is 30.

The square root of 137631720 is about 11731.6546147592. The cubic root of 137631720 is about 516.3048195963.

The spelling of 137631720 in words is "one hundred thirty-seven million, six hundred thirty-one thousand, seven hundred twenty".