61554890 has 8 divisors (see below), whose sum is σ = 110798820. Its totient is φ = 24621952.

The previous prime is 61554869. The next prime is 61554919. The reversal of 61554890 is 9845516.

It can be written as a sum of positive squares in 2 ways, for example, as 61011721 + 543169 = 7811^2 + 737^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3077735 + ... + 3077754.

Almost surely, 2^61554890 is an apocalyptic number.

61554890 is a deficient number, since it is larger than the sum of its proper divisors (49243930).

61554890 is a wasteful number, since it uses less digits than its factorization.

61554890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6155496.

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 61554890 is about 7845.6924487262. The cubic root of 61554890 is about 394.8397362988.

The spelling of 61554890 in words is "sixty-one million, five hundred fifty-four thousand, eight hundred ninety".