61613388 has 36 divisors (see below), whose sum is σ = 156265200. Its totient is φ = 20469216.

The previous prime is 61613369. The next prime is 61613407. The reversal of 61613388 is 88331616.

61613388 is a `hidden beast` number, since 6 + 1 + 613 + 38 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (61613369) and next prime (61613407).

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 8713 + ... + 14111.

It is an arithmetic number, because the mean of its divisors is an integer number (4340700).

Almost surely, 2^61613388 is an apocalyptic number.

It is an amenable number.

61613388 is an abundant number, since it is smaller than the sum of its proper divisors (94651812).

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

61613388 is a wasteful number, since it uses less digits than its factorization.

61613388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5726 (or 5721 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 61613388 is about 7849.4195963778. The cubic root of 61613388 is about 394.9647738709.

It can be divided in two parts, 61613 and 388, that added together give a square (62001 = 249²).

The spelling of 61613388 in words is "sixty-one million, six hundred thirteen thousand, three hundred eighty-eight".