61271520 has 48 divisors (see below), whose sum is σ = 193006800. Its totient is φ = 16338944.

The previous prime is 61271501. The next prime is 61271533. The reversal of 61271520 is 2517216.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×61271520² = 7508398326220800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 63345 + ... + 64304.

It is an arithmetic number, because the mean of its divisors is an integer number (4020975).

Almost surely, 2^61271520 is an apocalyptic number.

61271520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61271520 is an abundant number, since it is smaller than the sum of its proper divisors (131735280).

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

61271520 is a wasteful number, since it uses less digits than its factorization.

61271520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127667 (or 127659 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 61271520 is about 7827.6126628749. The cubic root of 61271520 is about 394.2329181866.

Adding to 61271520 its reverse (2517216), we get a palindrome (63788736).

The spelling of 61271520 in words is "sixty-one million, two hundred seventy-one thousand, five hundred twenty".