137978810 has 16 divisors (see below), whose sum is σ = 256926600. Its totient is φ = 53288256.

The previous prime is 137978803. The next prime is 137978821. The reversal of 137978810 is 18879731.

137978810 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 128436889 + 9541921 = 11333^2 + 3089^2 .

It is a super-2 number, since 2×137978810² = 38076304018032200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 237605 + ... + 238184.

Almost surely, 2^137978810 is an apocalyptic number.

137978810 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

137978810 is a deficient number, since it is larger than the sum of its proper divisors (118947790).

137978810 is a wasteful number, since it uses less digits than its factorization.

137978810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475825.

The product of its (nonzero) digits is 84672, while the sum is 44.

The square root of 137978810 is about 11746.4381835516. The cubic root of 137978810 is about 516.7384740062.

The spelling of 137978810 in words is "one hundred thirty-seven million, nine hundred seventy-eight thousand, eight hundred ten".