61406388 has 36 divisors (see below), whose sum is σ = 157099488. Its totient is φ = 20221200.

The previous prime is 61406377. The next prime is 61406407. The reversal of 61406388 is 88360416.

It is a happy number.

61406388 is a `hidden beast` number, since 6 + 14 + 0 + 638 + 8 = 666.

61406388 is digitally balanced in base 9, because in such base it contains all the possibile digits an equal number of times.

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).

61406388 is strictly pandigital in base 9.

It is a congruent number.

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, 7288 + ... + 13263.

Almost surely, 2^61406388 is an apocalyptic number.

It is an amenable number.

61406388 is an abundant number, since it is smaller than the sum of its proper divisors (95693100).

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

61406388 is a wasteful number, since it uses less digits than its factorization.

61406388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20644 (or 20639 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 61406388 is about 7836.2228145963. Note that the first 3 decimals coincide. The cubic root of 61406388 is about 394.5219618919.

The spelling of 61406388 in words is "sixty-one million, four hundred six thousand, three hundred eighty-eight".