61138590 has 32 divisors (see below), whose sum is σ = 147363840. Its totient is φ = 16233504.

The previous prime is 61138543. The next prime is 61138601. The reversal of 61138590 is 9583116.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2907 + ... + 11433.

It is an arithmetic number, because the mean of its divisors is an integer number (4605120).

Almost surely, 2^61138590 is an apocalyptic number.

61138590 is an abundant number, since it is smaller than the sum of its proper divisors (86225250).

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

61138590 is a wasteful number, since it uses less digits than its factorization.

61138590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8776.

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 61138590 is about 7819.1169578156. The cubic root of 61138590 is about 393.9476125731.

The spelling of 61138590 in words is "sixty-one million, one hundred thirty-eight thousand, five hundred ninety".