61540340 has 24 divisors (see below), whose sum is σ = 136837512. Its totient is φ = 23168000.

The previous prime is 61540333. The next prime is 61540351. The reversal of 61540340 is 4304516.

61540340 = T₂₈₅₇ + T₂₈₅₈ + ... + T₂₈₇₁.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 30426256 + 31114084 = 5516^2 + 5578^2 .

It is a super-3 number, since 3×61540340³ (a number of 24 digits) contains 333 as substring.

It is a congruent 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, 90161 + ... + 90840.

It is an arithmetic number, because the mean of its divisors is an integer number (5701563).

Almost surely, 2^61540340 is an apocalyptic number.

It is an amenable number.

61540340 is an abundant number, since it is smaller than the sum of its proper divisors (75297172).

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

61540340 is a wasteful number, since it uses less digits than its factorization.

61540340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181027 (or 181025 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 61540340 is about 7844.7651335142. The cubic root of 61540340 is about 394.8086238457.

Adding to 61540340 its reverse (4304516), we get a palindrome (65844856).

The spelling of 61540340 in words is "sixty-one million, five hundred forty thousand, three hundred forty".