1561677420 has 48 divisors (see below), whose sum is σ = 4378237920. Its totient is φ = 415919616.

The previous prime is 1561677407. The next prime is 1561677427. The reversal of 1561677420 is 247761651.

It is not an unprimeable number, because it can be changed into a prime (1561677427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32454 + ... + 64626.

It is an arithmetic number, because the mean of its divisors is an integer number (91213290).

Almost surely, 2^1561677420 is an apocalyptic number.

1561677420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1561677420 is an abundant number, since it is smaller than the sum of its proper divisors (2816560500).

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

1561677420 is a wasteful number, since it uses less digits than its factorization.

1561677420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32994 (or 32992 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 39.

The square root of 1561677420 is about 39518.0644768946. The cubic root of 1561677420 is about 1160.1935418246.

The spelling of 1561677420 in words is "one billion, five hundred sixty-one million, six hundred seventy-seven thousand, four hundred twenty".