61478388 has 18 divisors (see below), whose sum is σ = 155403794. Its totient is φ = 20492784.

The previous prime is 61478371. The next prime is 61478399. The reversal of 61478388 is 88387416.

It can be written as a sum of positive squares in only one way, i.e., 39463524 + 22014864 = 6282^2 + 4692^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 853831 + ... + 853902.

Almost surely, 2^61478388 is an apocalyptic number.

It is an amenable number.

61478388 is an abundant number, since it is smaller than the sum of its proper divisors (93925406).

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

61478388 is a wasteful number, since it uses less digits than its factorization.

61478388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1707743 (or 1707738 counting only the distinct ones).

The product of its digits is 258048, while the sum is 45.

The square root of 61478388 is about 7840.8155188093. The cubic root of 61478388 is about 394.6760961625.

It can be divided in two parts, 6147 and 8388, that added together give a triangular number (14535 = T₁₇₀).

The spelling of 61478388 in words is "sixty-one million, four hundred seventy-eight thousand, three hundred eighty-eight".