61701640 has 256 divisors, whose sum is σ = 197406720. Its totient is φ = 16727040.

The previous prime is 61701631. The next prime is 61701659. The reversal of 61701640 is 4610716.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 920887 + ... + 920953.

It is an arithmetic number, because the mean of its divisors is an integer number (771120).

Almost surely, 2^61701640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61701640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98703360).

61701640 is an abundant number, since it is smaller than the sum of its proper divisors (135705080).

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

61701640 is a wasteful number, since it uses less digits than its factorization.

61701640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132 (or 128 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 61701640 is about 7855.0391469426. The cubic root of 61701640 is about 395.1532599741.

The spelling of 61701640 in words is "sixty-one million, seven hundred one thousand, six hundred forty".