61888290 has 16 divisors (see below), whose sum is σ = 148531968. Its totient is φ = 16503536.

The previous prime is 61888289. The next prime is 61888303. The reversal of 61888290 is 9288816.

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, 1031442 + ... + 1031501.

It is an arithmetic number, because the mean of its divisors is an integer number (9283248).

Almost surely, 2^61888290 is an apocalyptic number.

61888290 is an abundant number, since it is smaller than the sum of its proper divisors (86643678).

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

61888290 is a wasteful number, since it uses less digits than its factorization.

61888290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2062953.

The product of its (nonzero) digits is 55296, while the sum is 42.

The square root of 61888290 is about 7866.9110837736. The cubic root of 61888290 is about 395.5513104944.

The spelling of 61888290 in words is "sixty-one million, eight hundred eighty-eight thousand, two hundred ninety".