61403538 has 16 divisors (see below), whose sum is σ = 140351040. Its totient is φ = 17543856.

The previous prime is 61403519. The next prime is 61403539. The reversal of 61403538 is 83530416.

61403538 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (61403539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 730953 + ... + 731036.

It is an arithmetic number, because the mean of its divisors is an integer number (8771940).

Almost surely, 2^61403538 is an apocalyptic number.

61403538 is an abundant number, since it is smaller than the sum of its proper divisors (78947502).

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

61403538 is a wasteful number, since it uses less digits than its factorization.

61403538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1462001.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 61403538 is about 7836.0409646709. The cubic root of 61403538 is about 394.5158582653.

The spelling of 61403538 in words is "sixty-one million, four hundred three thousand, five hundred thirty-eight".