61657470 has 256 divisors, whose sum is σ = 211507200. Its totient is φ = 12441600.

The previous prime is 61657423. The next prime is 61657483. The reversal of 61657470 is 7475616.

61657470 is a `hidden beast` number, since 6 + 16 + 574 + 70 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 610420 + ... + 610520.

It is an arithmetic number, because the mean of its divisors is an integer number (826200).

Almost surely, 2^61657470 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61657470, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105753600).

61657470 is an abundant number, since it is smaller than the sum of its proper divisors (149849730).

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

61657470 is a wasteful number, since it uses less digits than its factorization.

61657470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160 (or 154 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The square root of 61657470 is about 7852.2270726209. The cubic root of 61657470 is about 395.0589454306.

The spelling of 61657470 in words is "sixty-one million, six hundred fifty-seven thousand, four hundred seventy".