61800090 has 32 divisors (see below), whose sum is σ = 161804736. Its totient is φ = 14981760.

The previous prime is 61800077. The next prime is 61800107. The reversal of 61800090 is 9000816.

It is a super-2 number, since 2×61800090² = 7638502248016200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61800090.

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, 93307 + ... + 93966.

It is an arithmetic number, because the mean of its divisors is an integer number (5056398).

Almost surely, 2^61800090 is an apocalyptic number.

61800090 is an abundant number, since it is smaller than the sum of its proper divisors (100004646).

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

61800090 is a wasteful number, since it uses less digits than its factorization.

61800090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187294.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 61800090 is about 7861.3033270572. The cubic root of 61800090 is about 395.3633147143.

The spelling of 61800090 in words is "sixty-one million, eight hundred thousand, ninety".