61564404 has 48 divisors (see below), whose sum is σ = 158880960. Its totient is φ = 18397440.

The previous prime is 61564397. The next prime is 61564409. The reversal of 61564404 is 40446516.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61564409) 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, 6442 + ... + 12830.

It is an arithmetic number, because the mean of its divisors is an integer number (3310020).

Almost surely, 2^61564404 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 61564404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79440480).

61564404 is an abundant number, since it is smaller than the sum of its proper divisors (97316556).

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

61564404 is a wasteful number, since it uses less digits than its factorization.

61564404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6480 (or 6478 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 61564404 is about 7846.2987452684. The cubic root of 61564404 is about 394.8600775569.

It can be divided in two parts, 61 and 564404, that added together give a palindrome (564465).

The spelling of 61564404 in words is "sixty-one million, five hundred sixty-four thousand, four hundred four".