78401477 has 8 divisors (see below), whose sum is σ = 97747392. Its totient is φ = 61092000.

The previous prime is 78401461. The next prime is 78401497. The reversal of 78401477 is 77410487.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78401477 - 2⁴ = 78401461 is a prime.

It is a super-2 number, since 2×78401477² = 12293583191563058, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78401477.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78401497) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 509024 + ... + 509177.

It is an arithmetic number, because the mean of its divisors is an integer number (12218424).

Almost surely, 2^78401477 is an apocalyptic number.

78401477 is a gapful number since it is divisible by the number (77) formed by its first and last digit.

It is an amenable number.

78401477 is a deficient number, since it is larger than the sum of its proper divisors (19345915).

78401477 is a wasteful number, since it uses less digits than its factorization.

78401477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1018219.

The product of its (nonzero) digits is 43904, while the sum is 38.

The square root of 78401477 is about 8854.4608531519. The cubic root of 78401477 is about 427.9976799158.

The spelling of 78401477 in words is "seventy-eight million, four hundred one thousand, four hundred seventy-seven".