61531928 has 8 divisors (see below), whose sum is σ = 115372380. Its totient is φ = 30765960.

The previous prime is 61531913. The next prime is 61531933. The reversal of 61531928 is 82913516.

It is a tau number, because it is divible by the number of its divisors (8).

It is a nialpdrome in base 13.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3845738 + ... + 3845753.

Almost surely, 2^61531928 is an apocalyptic number.

It is an amenable number.

61531928 is a deficient number, since it is larger than the sum of its proper divisors (53840452).

61531928 is a wasteful number, since it uses less digits than its factorization.

61531928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7691497 (or 7691493 counting only the distinct ones).

The product of its digits is 12960, while the sum is 35.

The square root of 61531928 is about 7844.2289614722. The cubic root of 61531928 is about 394.7906341202.

The spelling of 61531928 in words is "sixty-one million, five hundred thirty-one thousand, nine hundred twenty-eight".