61555400 has 48 divisors (see below), whose sum is σ = 148065300. Its totient is φ = 23770880.

The previous prime is 61555399. The next prime is 61555411. The reversal of 61555400 is 455516.

It can be written as a sum of positive squares in 6 ways, for example, as 45185284 + 16370116 = 6722^2 + 4046^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 61555400.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 494 + ... + 11106.

Almost surely, 2^61555400 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61555400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74032650).

61555400 is an abundant number, since it is smaller than the sum of its proper divisors (86509900).

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

61555400 is a wasteful number, since it uses less digits than its factorization.

61555400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10658 (or 10649 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 61555400 is about 7845.7249505702. The cubic root of 61555400 is about 394.8408267494.

The spelling of 61555400 in words is "sixty-one million, five hundred fifty-five thousand, four hundred".