137881720 has 16 divisors (see below), whose sum is σ = 310233960. Its totient is φ = 55152672.

The previous prime is 137881687. The next prime is 137881739. The reversal of 137881720 is 27188731.

137881720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×137881720² = 38022737420316800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 137881720.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1723482 + ... + 1723561.

Almost surely, 2^137881720 is an apocalyptic number.

137881720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

137881720 is an abundant number, since it is smaller than the sum of its proper divisors (172352240).

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

137881720 is a wasteful number, since it uses less digits than its factorization.

137881720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3447054 (or 3447050 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 37.

The square root of 137881720 is about 11742.3047141522. The cubic root of 137881720 is about 516.6172430467.

It can be divided in two parts, 137881 and 720, that added together give a triangular number (138601 = T₅₂₆).

The spelling of 137881720 in words is "one hundred thirty-seven million, eight hundred eighty-one thousand, seven hundred twenty".