61158420 has 36 divisors (see below), whose sum is σ = 185514420. Its totient is φ = 16308864.

The previous prime is 61158389. The next prime is 61158439. The reversal of 61158420 is 2485116.

61158420 is a `hidden beast` number, since 61 + 1 + 584 + 20 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 8363664 + 52794756 = 2892^2 + 7266^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 169705 + ... + 170064.

Almost surely, 2^61158420 is an apocalyptic number.

61158420 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61158420 is an abundant number, since it is smaller than the sum of its proper divisors (124356000).

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

61158420 is a wasteful number, since it uses less digits than its factorization.

61158420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339784 (or 339779 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 61158420 is about 7820.3849010135. The cubic root of 61158420 is about 393.9901996240.

It can be divided in two parts, 6115 and 8420, that added together give a triangular number (14535 = T₁₇₀).

The spelling of 61158420 in words is "sixty-one million, one hundred fifty-eight thousand, four hundred twenty".