61401660 has 24 divisors (see below), whose sum is σ = 171924816. Its totient is φ = 16373760.

The previous prime is 61401653. The next prime is 61401689. The reversal of 61401660 is 6610416.

It is a self number, because there is not a number n which added to its sum of digits gives 61401660.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 511621 + ... + 511740.

It is an arithmetic number, because the mean of its divisors is an integer number (7163534).

Almost surely, 2^61401660 is an apocalyptic number.

61401660 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61401660 is an abundant number, since it is smaller than the sum of its proper divisors (110523156).

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

61401660 is a wasteful number, since it uses less digits than its factorization.

61401660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1023373 (or 1023371 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 61401660 is about 7835.9211328344. The cubic root of 61401660 is about 394.5118361934.

The spelling of 61401660 in words is "sixty-one million, four hundred one thousand, six hundred sixty".