61542420 has 24 divisors (see below), whose sum is σ = 172318944. Its totient is φ = 16411296.

The previous prime is 61542419. The next prime is 61542449. The reversal of 61542420 is 2424516.

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, 512794 + ... + 512913.

It is an arithmetic number, because the mean of its divisors is an integer number (7179956).

Almost surely, 2^61542420 is an apocalyptic number.

61542420 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61542420 is an abundant number, since it is smaller than the sum of its proper divisors (110776524).

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

61542420 is a wasteful number, since it uses less digits than its factorization.

61542420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1025719 (or 1025717 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 61542420 is about 7844.8977048780. The cubic root of 61542420 is about 394.8130718370.

Adding to 61542420 its reverse (2424516), we get a palindrome (63966936).

The spelling of 61542420 in words is "sixty-one million, five hundred forty-two thousand, four hundred twenty".