61117890 has 32 divisors (see below), whose sum is σ = 155312640. Its totient is φ = 15339264.

The previous prime is 61117879. The next prime is 61117891. The reversal of 61117890 is 9871116.

It is not an unprimeable number, because it can be changed into a prime (61117891) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59410 + ... + 60429.

It is an arithmetic number, because the mean of its divisors is an integer number (4853520).

Almost surely, 2^61117890 is an apocalyptic number.

61117890 is an abundant number, since it is smaller than the sum of its proper divisors (94194750).

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

61117890 is a wasteful number, since it uses less digits than its factorization.

61117890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119866.

The product of its (nonzero) digits is 3024, while the sum is 33.

The square root of 61117890 is about 7817.7931668726. The cubic root of 61117890 is about 393.9031472794.

The spelling of 61117890 in words is "sixty-one million, one hundred seventeen thousand, eight hundred ninety".